diff --git a/expanded.html b/expanded.html
index 0c8b3992..477107e0 100644
--- a/expanded.html
+++ b/expanded.html
@@ -16,70 +16,75 @@
   <body>
     <div id="genoverse"></div>
 
-    <script type="text/javascript" src="js/lib/jquery.js"></script>
-    <script type="text/javascript" src="js/lib/jquery-ui.js"></script>
-    <script type="text/javascript" src="js/lib/jquery.mousewheel.js"></script>
-    <script type="text/javascript" src="js/lib/jquery.mousehold.js"></script>
-    <script type="text/javascript" src="js/lib/jquery.tipsy.js"></script>
-    <script type="text/javascript" src="js/lib/Base.js"></script>
-    <script type="text/javascript" src="js/lib/rtree.js"></script>
-    <script type="text/javascript" src="js/lib/dalliance-lib.min.js"></script>
-    <script type="text/javascript" src="js/lib/jDataView.js"></script>
-    <script type="text/javascript" src="js/lib/jParser.js"></script>
-    <script type="text/javascript" src="js/lib/VCFReader.js"></script>
-    <script type="text/javascript" src="js/Genoverse.js"></script>
-    <script type="text/javascript" src="js/Track.js"></script>
-    <script type="text/javascript" src="js/Track/Controller.js"></script>
-    <script type="text/javascript" src="js/Track/Model.js"></script>
-    <script type="text/javascript" src="js/Track/View.js"></script>
-    <script type="text/javascript" src="js/Track/library/Static.js"></script>
-    <script type="text/javascript" src="js/Track/Controller/Stranded.js"></script>
-    <script type="text/javascript" src="js/Track/Model/Stranded.js"></script>
-    <script type="text/javascript" src="js/Track/library/Graph.js"></script>
-    <script type="text/javascript" src="js/Track/library/Graph/Bar.js"></script>
-    <script type="text/javascript" src="js/Track/library/Graph/Line.js"></script>
-    <script type="text/javascript" src="js/Track/Controller/Sequence.js"></script>
-    <script type="text/javascript" src="js/Track/Model/Sequence.js"></script>
-    <script type="text/javascript" src="js/Track/Model/Sequence/Fasta.js"></script>
-    <script type="text/javascript" src="js/Track/Model/Sequence/Ensembl.js"></script>
-    <script type="text/javascript" src="js/Track/View/Sequence.js"></script>
-    <script type="text/javascript" src="js/Track/View/Sequence/Variation.js"></script>
-    <script type="text/javascript" src="js/Track/Model/SequenceVariation.js"></script>
-    <script type="text/javascript" src="js/Track/Model/Gene.js"></script>
-    <script type="text/javascript" src="js/Track/Model/Gene/Ensembl.js"></script>
-    <script type="text/javascript" src="js/Track/View/Gene.js"></script>
-    <script type="text/javascript" src="js/Track/View/Gene/Ensembl.js"></script>
-    <script type="text/javascript" src="js/Track/Model/Transcript.js"></script>
-    <script type="text/javascript" src="js/Track/Model/Transcript/Ensembl.js"></script>
-    <script type="text/javascript" src="js/Track/View/Transcript.js"></script>
-    <script type="text/javascript" src="js/Track/View/Transcript/Ensembl.js"></script>
-    <script type="text/javascript" src="js/Track/Model/File.js"></script>
-    <script type="text/javascript" src="js/Track/Model/File/BAM.js"></script>
-    <script type="text/javascript" src="js/Track/Model/File/BED.js"></script>
-    <script type="text/javascript" src="js/Track/Model/File/GFF.js"></script>
-    <script type="text/javascript" src="js/Track/Model/File/VCF.js"></script>
-    <script type="text/javascript" src="js/Track/Model/File/WIG.js"></script>
-    <script type="text/javascript" src="js/Track/library/Chromosome.js"></script>
-    <script type="text/javascript" src="js/Track/library/dbSNP.js"></script>
-    <script type="text/javascript" src="js/Track/library/File.js"></script>
-    <script type="text/javascript" src="js/Track/library/File/BAM.js"></script>
-    <script type="text/javascript" src="js/Track/library/File/BED.js"></script>
-    <script type="text/javascript" src="js/Track/library/File/GFF.js"></script>
-    <script type="text/javascript" src="js/Track/library/File/VCF.js"></script>
-    <script type="text/javascript" src="js/Track/library/File/WIG.js"></script>
-    <script type="text/javascript" src="js/Track/library/Gene.js"></script>
-    <script type="text/javascript" src="js/Track/library/HighlightRegion.js"></script>
-    <script type="text/javascript" src="js/Track/library/Legend.js"></script>
-    <script type="text/javascript" src="js/Track/library/Scaleline.js"></script>
-    <script type="text/javascript" src="js/Track/library/Scalebar.js"></script>
-    <script type="text/javascript" src="js/plugins/controlPanel.js"></script>
-    <script type="text/javascript" src="js/plugins/fileDrop.js"></script>
-    <script type="text/javascript" src="js/plugins/focusRegion.js"></script>
-    <script type="text/javascript" src="js/plugins/fullscreen.js"></script>
-    <script type="text/javascript" src="js/plugins/karyotype.js"></script>
-    <script type="text/javascript" src="js/plugins/resizer.js"></script>
-    <script type="text/javascript" src="js/plugins/tooltips.js"></script>
-    <script type="text/javascript" src="js/plugins/trackControls.js"></script>
+        <script type="text/javascript" src="js/lib/jquery.js"></script>
+        <script type="text/javascript" src="js/lib/jquery-ui.js"></script>
+        <script type="text/javascript" src="js/lib/jquery.mousewheel.js"></script>
+        <script type="text/javascript" src="js/lib/jquery.mousehold.js"></script>
+        <script type="text/javascript" src="js/lib/jquery.tipsy.js"></script>
+        <script type="text/javascript" src="js/lib/Base.js"></script>
+        <script type="text/javascript" src="js/lib/rtree.js"></script>
+        <script type="text/javascript" src="js/lib/dalliance-lib.min.js"></script>
+        <script type="text/javascript" src="js/lib/jDataView.js"></script>
+        <script type="text/javascript" src="js/lib/jParser.js"></script>
+        <script type="text/javascript" src="js/lib/VCFReader.js"></script>
+        <script type="text/javascript" src="js/lib/BWReader.js"></script>
+        <script type="text/javascript" src="js/Genoverse.js"></script>
+        <script type="text/javascript" src="js/Track.js"></script>
+        <script type="text/javascript" src="js/Track/Controller.js"></script>
+        <script type="text/javascript" src="js/Track/Model.js"></script>
+        <script type="text/javascript" src="js/Track/View.js"></script>
+        <script type="text/javascript" src="js/Track/library/Static.js"></script>
+        <script type="text/javascript" src="js/Track/Controller/Stranded.js"></script>
+        <script type="text/javascript" src="js/Track/Model/Stranded.js"></script>
+        <script type="text/javascript" src="js/Track/library/Graph.js"></script>
+        <script type="text/javascript" src="js/Track/library/Graph/Bar.js"></script>
+        <script type="text/javascript" src="js/Track/library/Graph/Line.js"></script>
+        <script type="text/javascript" src="js/Track/Controller/Sequence.js"></script>
+        <script type="text/javascript" src="js/Track/Model/Sequence.js"></script>
+        <script type="text/javascript" src="js/Track/Model/Sequence/Fasta.js"></script>
+        <script type="text/javascript" src="js/Track/Model/Sequence/Ensembl.js"></script>
+        <script type="text/javascript" src="js/Track/View/Sequence.js"></script>
+        <script type="text/javascript" src="js/Track/View/Sequence/Variation.js"></script>
+        <script type="text/javascript" src="js/Track/Model/SequenceVariation.js"></script>
+        <script type="text/javascript" src="js/Track/Model/Gene.js"></script>
+        <script type="text/javascript" src="js/Track/Model/Gene/Ensembl.js"></script>
+        <script type="text/javascript" src="js/Track/View/Gene.js"></script>
+        <script type="text/javascript" src="js/Track/View/Gene/Ensembl.js"></script>
+        <script type="text/javascript" src="js/Track/Model/Transcript.js"></script>
+        <script type="text/javascript" src="js/Track/Model/Transcript/Ensembl.js"></script>
+        <script type="text/javascript" src="js/Track/View/Transcript.js"></script>
+        <script type="text/javascript" src="js/Track/View/Transcript/Ensembl.js"></script>
+        <script type="text/javascript" src="js/Track/Model/File.js"></script>
+        <script type="text/javascript" src="js/Track/Model/File/BAM.js"></script>
+        <script type="text/javascript" src="js/Track/Model/File/BED.js"></script>
+        <script type="text/javascript" src="js/Track/Model/File/GFF.js"></script>
+        <script type="text/javascript" src="js/Track/Model/File/VCF.js"></script>
+        <script type="text/javascript" src="js/Track/Model/File/WIG.js"></script>
+        <script type="text/javascript" src="js/Track/Model/File/BIGWIG.js"></script>
+        <script type="text/javascript" src="js/Track/Model/File/BIGBED.js"></script>
+        <script type="text/javascript" src="js/Track/library/Chromosome.js"></script>
+        <script type="text/javascript" src="js/Track/library/dbSNP.js"></script>
+        <script type="text/javascript" src="js/Track/library/File.js"></script>
+        <script type="text/javascript" src="js/Track/library/File/BAM.js"></script>
+        <script type="text/javascript" src="js/Track/library/File/BED.js"></script>
+        <script type="text/javascript" src="js/Track/library/File/GFF.js"></script>
+        <script type="text/javascript" src="js/Track/library/File/VCF.js"></script>
+        <script type="text/javascript" src="js/Track/library/File/WIG.js"></script>
+        <script type="text/javascript" src="js/Track/library/File/BIGWIG.js"></script>
+        <script type="text/javascript" src="js/Track/library/File/BIGBED.js"></script>
+        <script type="text/javascript" src="js/Track/library/Gene.js"></script>
+        <script type="text/javascript" src="js/Track/library/HighlightRegion.js"></script>
+        <script type="text/javascript" src="js/Track/library/Legend.js"></script>
+        <script type="text/javascript" src="js/Track/library/Scaleline.js"></script>
+        <script type="text/javascript" src="js/Track/library/Scalebar.js"></script>
+        <script type="text/javascript" src="js/plugins/controlPanel.js"></script>
+        <script type="text/javascript" src="js/plugins/fileDrop.js"></script>
+        <script type="text/javascript" src="js/plugins/focusRegion.js"></script>
+        <script type="text/javascript" src="js/plugins/fullscreen.js"></script>
+        <script type="text/javascript" src="js/plugins/karyotype.js"></script>
+        <script type="text/javascript" src="js/plugins/resizer.js"></script>
+        <script type="text/javascript" src="js/plugins/tooltips.js"></script>
+        <script type="text/javascript" src="js/plugins/trackControls.js"></script>
 
     <script>
       window.genoverse = new Genoverse({
diff --git a/js/Track/Model/File/BED.js b/js/Track/Model/File/BED.js
index ec432423..69992d2a 100644
--- a/js/Track/Model/File/BED.js
+++ b/js/Track/Model/File/BED.js
@@ -3,7 +3,7 @@ Genoverse.Track.Model.File.BED = Genoverse.Track.Model.File.extend({
     var lines = text.split('\n');
 
     for (var i = 0; i < lines.length; i++) {
-      var fields = lines[i].split('\t');
+      var fields = lines[i].split('\t').filter(function(n){ return n; });
 
       if (fields.length < 3 || fields[0] == 'track' || fields[0] == 'browser') {
         continue;
@@ -32,7 +32,7 @@ Genoverse.Track.Model.File.BED = Genoverse.Track.Model.File.extend({
         if (fields[8]) {
           color = 'rgb(' + fields[8] + ')';
         } else {
-          color = this.scoreColor(isNaN(score) ? 1000 : score);
+          color = this.scoreColor(isNaN(feature.score) ? 1000 : score);
         }
 
         if(len == 12){ //subfeatures present
diff --git a/js/Track/Model/File/BIGBED.js b/js/Track/Model/File/BIGBED.js
new file mode 100644
index 00000000..197bcea1
--- /dev/null
+++ b/js/Track/Model/File/BIGBED.js
@@ -0,0 +1,51 @@
+Genoverse.Track.Model.File.BIGBED = Genoverse.Track.Model.File.extend({
+  getData: function (chr, start, end) {
+    var model    = this;
+    var deferred = $.Deferred();
+
+    if (!this.bigbedFile) {
+      this.bigbedFile = this.bigbedFile || (this.url ? new dallianceLib.URLFetchable(this.url) : new dallianceLib.BlobFetchable(this.track.dataFile));
+    }
+
+    var d = $.Deferred().done(function () {
+      model.bb.getValues(chr, start, end, function (features, error) {
+        if (!error) {
+          features.sort(function (a, b) { return a.start - b.start; });
+          model.receiveData(features.join('\n'), chr, features[0].start, features[features.length - 1].end);
+          deferred.resolveWith(model);
+        }
+      });
+    });
+
+    if (model.bb) {
+      d.resolve();
+    } else {
+      new BWReader(this.bigbedFile, function (bb) {
+        if (bb) {
+          model.bb = bb;
+          d.resolve();
+        } else {
+          model.receiveData([], chr, start, end);
+          return deferred.resolveWith(model);
+        }
+      });
+    }
+
+    return deferred;
+  },
+  parseData : function(data, chr, start, end){
+    return Genoverse.Track.Model.File.BED.prototype.parseData.call(this, data, chr);
+  },
+
+  scoreColor: function (score) {
+    if (score <= 166) { return 'rgb(219,219,219)'; }
+    if (score <= 277) { return 'rgb(186,186,186)'; }
+    if (score <= 388) { return 'rgb(154,154,154)'; }
+    if (score <= 499) { return 'rgb(122,122,122)'; }
+    if (score <= 611) { return 'rgb(94,94,94)';    }
+    if (score <= 722) { return 'rgb(67,67,67)';    }
+    if (score <= 833) { return 'rgb(42,42,42)';    }
+    if (score <= 944) { return 'rgb(21,21,21)';    }
+    return '#000000';
+  }
+});
diff --git a/js/Track/Model/File/BIGWIG.js b/js/Track/Model/File/BIGWIG.js
new file mode 100644
index 00000000..72ddd11a
--- /dev/null
+++ b/js/Track/Model/File/BIGWIG.js
@@ -0,0 +1,36 @@
+Genoverse.Track.Model.File.BIGWIG = Genoverse.Track.Model.Graph.Bar.extend({
+  getData: function (chr, start, end) {
+    var model    = this;
+    var deferred = $.Deferred();
+
+    if (!this.bigwigFile) {
+      this.bigwigFile = this.bigwigFile || (this.url ? new dallianceLib.URLFetchable(this.url) : new dallianceLib.BlobFetchable(this.track.dataFile));
+    }
+
+    var d = $.Deferred().done(function () {
+      model.bw.getValues(chr, start, end, function (features, error) {
+        if (!error) {
+          features.sort(function (a, b) { return a.start - b.start; });
+          model.receiveData(features, chr, features[0].start, features[features.length - 1].end);
+          deferred.resolveWith(model);
+        }
+      });
+    });
+
+    if (model.bw) {
+      d.resolve();
+    } else {
+      new BWReader(this.bigwigFile, function (bw) {
+        if (bw) {
+          model.bw = bw;
+          d.resolve();
+        } else {
+          model.receiveData([], chr, start, end);
+          return deferred.resolveWith(model);
+        }
+      });
+    }
+
+    return deferred;
+  }
+});
diff --git a/js/Track/library/File/BIGBED.js b/js/Track/library/File/BIGBED.js
new file mode 100644
index 00000000..25450560
--- /dev/null
+++ b/js/Track/library/File/BIGBED.js
@@ -0,0 +1,12 @@
+Genoverse.Track.File.BIGBED = Genoverse.Track.File.extend({
+  model  : Genoverse.Track.Model.File.BIGBED,
+  name   : 'bigbed',
+  bump          : true,
+  featureHeight : 10,
+  thickHeight   : 10,
+  thinHeight    : 7,
+  subFeatureJoinStyle : "curve",
+  height :50
+});
+
+Genoverse.Track.File.BB = Genoverse.Track.File.BIGBED;
diff --git a/js/Track/library/File/BIGWIG.js b/js/Track/library/File/BIGWIG.js
new file mode 100644
index 00000000..2327f12e
--- /dev/null
+++ b/js/Track/library/File/BIGWIG.js
@@ -0,0 +1,7 @@
+Genoverse.Track.File.BIGWIG = Genoverse.Track.Graph.Bar.extend({
+  model  : Genoverse.Track.Model.File.BIGWIG,
+  name   : 'bigwig',
+  height : 100
+});
+
+Genoverse.Track.File.BW = Genoverse.Track.File.BIGWIG;
diff --git a/js/lib/BWReader.js b/js/lib/BWReader.js
new file mode 100644
index 00000000..2771bee7
--- /dev/null
+++ b/js/lib/BWReader.js
@@ -0,0 +1,567 @@
+(function () {
+  var BWReader = function (data, callback) {
+    // constants: bigwig/bigbed file header signatures (magic numbers) (32 bit) , can be swapped ( big-endian | BE )
+    var BIG_WIG_MAGIC    = 0x888FFC26;
+    var BIG_WIG_MAGIC_BE = 0x26FC8F88;
+
+    var BIG_BED_MAGIC    = 0x8789F2EB;
+    var BIG_BED_MAGIC_BE = 0xEBF28987;
+
+    var CIRTREE_MAGIC = 0x78ca8c91;
+    var IDXTREE_MAGIC = 0x2468ace0;
+
+    // type of file converted to bigwig bedgraph |variable step wiggle | fixed step wiggle
+    var BIG_WIG_TYPE_GRAPH = 1;
+    var BIG_WIG_TYPE_VSTEP = 2;
+    var BIG_WIG_TYPE_FSTEP = 3;
+
+    // bigbed data color regex
+    var BED_COLOR_REGEXP = new RegExp("^[0-9]+,[0-9]+,[0-9]+");
+
+    var M1 = 256;
+    var M2 = 256*256;
+    var M3 = 256*256*256;
+    var M4 = 256*256*256*256;
+
+    var bbi = {
+      fetchedData: {}
+    };
+
+    function init() {
+      checkSignature();
+    }
+
+    function getData(start, length, cb) {
+      if (bbi.fetchedData[start + ':' + length]) {
+        cb(bbi.fetchedData[start + ':' + length]);
+      } else {
+        data.slice(start, length).fetch(function (d) {
+          bbi.fetchedData[start + ':' + length] = d;
+          cb(d);
+        });
+      }
+    }
+
+    function checkSignature() {
+      getData(0, 512, function (header) {
+        var ba    = new Uint8Array(header);
+        var sa    = new Uint16Array(header);
+        var la    = new Uint32Array(header);
+        var magic = la[0];
+        var error, reduction, dataOffset, indexOffset;
+
+        if (magic === BIG_WIG_MAGIC) {
+          bbi.type = 'bigwig';
+        } else if (magic === BIG_BED_MAGIC) {
+          bbi.type = 'bigbed';
+        } else if (magic === BIG_WIG_MAGIC_BE || magic === BIG_BED_MAGIC_BE) {
+          error = 'big-endian files not supported yet!';
+        } else{
+          error = 'unsupported file format';
+        }
+
+        if (error) {
+          callback(null, error);
+        }
+
+        bbi.version             = sa[2];
+        bbi.numZoomLevels       = sa[3];
+        bbi.chromTreeOffset     = read64Bit(ba, 8);
+        bbi.unzoomedDataOffset  = read64Bit(ba, 16);
+        bbi.unzoomedIndexOffset = read64Bit(ba, 24);
+        bbi.fieldCount          = sa[16];
+        bbi.definedFieldCount   = sa[17];
+        bbi.asOffset            = read64Bit(ba, 36);
+        bbi.totalSummaryOffset  = read64Bit(ba, 44);
+        bbi.uncompressBufSize   = la[13];
+        bbi.extHeaderOffset     = read64Bit(ba, 56);
+        bbi.compressed          = bbi.uncompressBufSize  > 0;
+        bbi.summary             = bbi.totalSummaryOffset > 0;
+        bbi.extHeader           = bbi.extHeaderOffset    > 0;
+        bbi.zoomHeaders         = [];
+
+        for (var i = 0; i < bbi.numZoomLevels; i++) {
+          reduction   = la[16 + 6*i];
+          dataOffset  = read64Bit(ba, 72 + 24*i);
+          indexOffset = read64Bit(ba, 80 + 24*i);
+
+          bbi.zoomHeaders.push({
+            reductionLevel : reduction,
+            dataOffset     : dataOffset,
+            indexOffset    : indexOffset
+          });
+        }
+
+        readAutoSQL(readChromTree); // reading autoSQL passing next task as callback
+      });
+    }
+
+    // autoSQL could be present in some bigbed files
+    function readAutoSQL(cb) {
+      if (bbi.asOffset === 0) {
+        cb(); // no autoSQL present
+      } else {
+        // autoSQL present, need to parse
+        getData(bbi.asOffset, 2048, function (d) {
+          var ba = new Uint8Array(d);
+          var s  = '';
+
+          for (var i = 0; i < ba.length; i++) {
+            if (ba[i] === 0) {
+              break;
+            }
+
+            s += String.fromCharCode(ba[i]);
+          }
+
+          var header_re   = /(\w+)\s+(\w+)\s+("([^"]+)")?\s*\(\s*/;
+          var field_re    = /([\w\[\]]+)\s+(\w+)\s*;\s*("([^"]+)")?\s*/g;
+          var headerMatch = header_re.exec(s);
+
+          if (headerMatch) {
+            var as = {
+              declType : headerMatch[1],
+              name     : headerMatch[2],
+              comment  : headerMatch[4],
+              fields   : []
+            };
+
+            s = s.substring(headerMatch[0]);
+
+            for (var m = field_re.exec(s); m !== null; m = field_re.exec(s)) {
+              as.fields.push({
+                type    : m[1],
+                name    : m[2],
+                comment : m[4]
+              });
+            }
+
+            bbi.schema = as;
+          }
+
+          cb();
+        });
+      }
+    }
+
+    // reading B+ tree which maps chrom names to ids used in R-tree
+    function readChromTree() {
+      var len = bbi.unzoomedDataOffset - bbi.chromTreeOffset;
+          len = len + (4 - len%4);
+
+      getData(bbi.chromTreeOffset, len, function (d) {
+        var ba    = new Uint8Array(d);
+        var sa    = new Uint16Array(d);
+        var la    = new Uint32Array(d);
+        var magic = la[0];
+        var error;
+
+        function readChromTreeLeaf(nodeOffset) {
+          // padding 8 byte
+          var children = sa[(nodeOffset/2) + 1];
+          var offset   = nodeOffset + 4;
+          var chrom, i, c, idx, len;
+
+          while (children > 0) {
+            children--;
+            chrom = '';
+
+            for (i = 0; i < bbi.bpTree.keySize; i++) {
+              c = ba[offset + i];
+
+              if (c !== 0) {
+                chrom += String.fromCharCode(c);
+              }
+            }
+
+            offset += bbi.bpTree.keySize;
+
+            idx = (ba[offset + 3] << 24) | (ba[offset + 2] << 16) | (ba[offset + 1] << 8) | (ba[offset + 0]);
+            len = (ba[offset + 7] << 24) | (ba[offset + 6] << 16) | (ba[offset + 5] << 8) | (ba[offset + 4]);
+
+            offset += 8;
+
+            bbi.chroms[idx]  = chrom;
+            bbi.lengths[idx] = len;
+          }
+        }
+
+        if (magic === CIRTREE_MAGIC) {
+          bbi.bpTree = {
+            itemsPerBlock : la[1],
+            keySize       : la[2],
+            valueSize     : la[3],
+            itemCount     : read64Bit(ba, 16)
+          };
+
+          bbi.chroms  = new Array(bbi.bpTree.itemCount);
+          bbi.lengths = new Array(bbi.bpTree.itemCount);
+        } else {
+          error = 'chromosome id B+ tree not found!';
+        }
+
+        if (error) {
+          callback(null, error);
+        } else {
+          readChromTreeLeaf(32);
+        }
+
+        readRTreeIndex();
+      });
+    }
+
+    function readRTreeIndex() {
+      getData(bbi.unzoomedIndexOffset, 48, function (d) {
+        var ba    = new Uint8Array(d);
+        var la    = new Uint32Array(d);
+        var magic = la[0];
+
+        if (magic === IDXTREE_MAGIC) {
+          bbi.Rheader = {
+            blockSize     : la[1],
+            nItems        : read64Bit(ba, 8),
+            chrIdxStart   : la[4],
+            baseStart     : la[5],
+            chrIdxEnd     : la[6],
+            baseEnd       : la[7],
+            endFileOffset : read64Bit(ba, 32),
+            nItemsPerSlot : la[10]
+          };
+
+          bbi.rootOffset = bbi.unzoomedIndexOffset + 48;
+          bbi.getValues  = getValues;
+
+          callback(bbi);
+        } else {
+          callback(null, 'R-tree not found!');
+        }
+      });
+    }
+
+    function getRTreeNode(treedata, offset) {
+      var ba       = new Uint8Array(treedata);
+      var sa       = new Uint16Array(treedata);
+      var la       = new Uint32Array(treedata);
+      var children = sa[offset/2 + 1];
+      var lo;
+
+      var node = {
+        isLeaf      : ba[offset],
+        children    : children,
+        chrIdxStart : new Array(children),
+        baseStart   : new Array(children),
+        chrIdxEnd   : new Array(children),
+        baseEnd     : new Array(children),
+        dataOffset  : new Array(children),
+        x           : {}
+      };
+
+      if (node.isLeaf) {
+        node.x.size = new Array(children);
+      } else {
+        node.x.child = new Array(children).fill(-1);
+      }
+
+      offset += 4;
+
+      for (var i = 0; i< node.children; i++) {
+        lo = offset / 4;
+
+        node.chrIdxStart[i] = la[lo];
+        node.baseStart[i]   = la[lo + 1];
+        node.chrIdxEnd[i]   = la[lo + 2];
+        node.baseEnd[i]     = la[lo + 3];
+        node.dataOffset[i]  = read64Bit(ba, offset + 16);
+
+        offset += 24;
+
+        if (node.isLeaf) {
+          node.x.size[i] = read64Bit(ba, offset);
+          offset += 8;
+        }
+      }
+
+      return node;
+    }
+
+    function getValues(chrom, start, end, cb) {
+      var vals    = [];
+      var chromid = bbi.chroms.indexOf(chrom);
+
+      if (chromid == -1) {
+        chromid = bbi.chroms.indexOf('chr' + chrom);
+
+        if (chromid == -1) {
+          return cb([], 'chrom not found');
+        }
+      }
+
+      var query = {
+        chrom : chromid,
+        start : start,
+        end   : end
+      };
+
+      function traverseRTree() {
+        var outstanding = 0;
+
+        function fetchRTreeKids(offset, level) {
+          outstanding += offset.length;
+
+          var min         = offset[0];
+          var maxNodeSize = 4 + bbi.Rheader.blockSize*32;
+          var max         = offset[offset.length - 1] + maxNodeSize;
+
+          getData(min, max - min, function (treedata) {
+            // traverse kids
+            for (var i = 0; i < offset.length; i++) {
+              traverseRTreeKids(treedata, offset[i] - min, level);
+
+              if (--outstanding === 0) {
+                fetchBlocks();
+              }
+            }
+          });
+        }
+
+        function traverseRTreeKids(treedata, offset, level) {
+          var node     = getRTreeNode(treedata, offset);
+          var overlaps = findOverlaps(node);
+          var i;
+
+          if (node.isLeaf) {
+            for (i = 0; i < overlaps.length; i++){
+              vals.push({
+                offset : node.dataOffset[overlaps[i]],
+                size   : node.x.size[overlaps[i]]
+              });
+            }
+
+            return [];
+          } else {
+            fetchRTreeKids(overlaps.map(function (o) { return node.dataOffset[o]; }), level + 1);
+          }
+        }
+
+        function findOverlaps(node) {
+          var children = node.children;
+          var overlaps = [];
+
+          for (var i = 0; i < children; i++) {
+            var startChrom = node.chrIdxStart[i];
+            var startBase  = node.baseStart[i];
+            var endChrom   = node.chrIdxEnd[i];
+            var endBase    = node.baseEnd[i];
+
+            if (
+              ((startChrom < query.chrom) || (startChrom == query.chrom && startBase <= query.end)) &&
+              ((endChrom   > query.chrom) || (endChrom   == query.chrom && endBase   >= query.start))
+            ) {
+              overlaps.push(i);
+            }
+          }
+
+          return overlaps;
+        }
+
+        fetchRTreeKids([bbi.rootOffset], 1);
+      }
+
+      function fetchBlocks() {
+        vals.sort(function (b0, b1) {
+          return (b0.offset | 0) - (b1.offset | 0);
+        });
+
+        if (vals.length === 0) {
+          return getBlocks();
+        }
+
+        var totalSize = 0;
+        var base      = vals[0].offset;
+
+        for (var i = 0; i < vals.length; i++) {
+          totalSize += vals[i].size;
+        }
+
+        getData(base, totalSize, function (buffer) {
+          var ioffset = 0;
+          var bi      = 0;
+          var fb, blockData;
+
+          while (ioffset < totalSize) {
+            fb = vals[bi];
+
+            if (bbi.uncompressBufSize > 0) {
+              blockData = dallianceLib.inflateBuffer(buffer, ioffset + 2, fb.size - 2);
+            } else {
+              blockData = buffer.slice(ioffset, ioffset + fb.size);
+            }
+
+            vals[bi].data = blockData;
+            ioffset      += fb.size;
+            bi++;
+          }
+
+          getBlocks();
+        });
+      }
+
+      function getBlocks() {
+        var parser = bbi.type == 'bigwig' ? WiggleParser : bbi.type == 'bigbed' ? BEDParser : false;
+        var result = [];
+
+        if (parser && vals.length) {
+          for (var i = 0; i < vals.length; i++) {
+            result = result.concat(parser(vals[i].data, query));
+          }
+        }
+
+        cb(result);
+      }
+
+      traverseRTree();
+    }
+
+    function WiggleParser(data, query) {
+      var arr        = [];
+      var ba         = new Uint8Array(data);
+      var sa         = new Int16Array(data);
+      var la         = new Int32Array(data);
+      var fa         = new Float32Array(data);
+      var chromId    = la[0];
+      var chr        = parseInt(bbi.chroms[chromId].replace('chr', ''), 10);
+      var blockStart = la[1] + 1;
+      var blockEnd   = la[2];
+      var itemStep   = la[3];
+      var itemSpan   = la[4];
+      var blockType  = ba[20];
+      var itemCount  = sa[11];
+      var i, start, end, score;
+
+      if (blockType === BIG_WIG_TYPE_FSTEP) { // fixedStep wiggle
+        for (i = 0; i < itemCount; i++) {
+          start = blockStart + i*itemStep;
+          end   = start + itemSpan - 1;
+          score = fa[i + 6];
+
+          if (chromId == query.chrom) {
+            arr.push({
+              chr    : chr,
+              start  : start,
+              end    : end,
+              height : score
+            });
+          }
+        }
+      } else if (blockType === BIG_WIG_TYPE_VSTEP) { // variable step wiggle
+        for (i = 0; i < itemCount; i++) {
+          start = la[i*2 + 6] + 1;
+          end   = start + itemSpan - 1;
+          score = fa[i*2 + 7];
+
+          if (chromId == query.chrom) {
+            arr.push({
+              chr    : chr,
+              start  : start,
+              end    : end,
+              height : score
+            });
+          }
+        }
+      } else if (blockType === BIG_WIG_TYPE_GRAPH) { // bedGraph
+        for (i = 0; i < itemCount; i++) {
+          start = la[i*3 + 6] + 1;
+          end   = la[i*3 + 7];
+          score = fa[i*3 + 8];
+
+          if (start > end) {
+            start = end;
+          }
+
+          if (chromId == query.chrom) {
+            arr.push({
+              chr    : chr,
+              start  : start,
+              end    : end,
+              height : score
+            });
+          }
+        }
+      }
+
+      return arr;
+    }
+
+    function BEDParser(data, query) {
+      if(bbi.totalSummaryOffset) console.log("summmary");
+      var arr        = [];
+      var ba         = new Uint8Array(data);
+      var sa         = new Int16Array(data);
+      var la         = new Int32Array(data);
+      var dfc        = bbi.definedFieldCount;
+      var offset = 0, rest;
+      var bbRecord = {}
+      var bbdata = "";
+
+      while(offset < la.length){
+        bbRecord.chromid = la[offset];
+        bbRecord.chr     = bbi.chroms[bbRecord.chromid];
+        bbRecord.start   = la[offset + 1];
+        bbRecord.end     = la[offset + 2];
+        offset += 12;
+
+        while(true){
+          var ch = ba[offset++];
+          if(ch != 0) rest += String.fromCharCode(ch);
+          else break;
+        }
+
+        if(bbRecord.chromid == query.chrom){
+          bbdata = "";
+          bbdata = [bbRecord.chr, bbRecord.start, bbRecord.end, rest].join('\t');
+          arr.push(bbdata);
+        }
+      }
+
+      return arr;
+    }
+
+    //reads 8 bytes from data
+    function read64Bit(ba, o) {
+      var val = ba[o] + ba[o+1]*M1 + ba[o+2]*M2 + ba[o+3]*M3 + ba[o+4]*M4;
+      return val;
+    }
+
+    function readFloat(ba, o) {
+      var a = new Uint8Array([ ba[o], ba[o+1], ba[o+2], ba[o+3] ]);
+      var b = a.buffer;
+      var c = new Float32Array(b);
+      return c[0];
+    }
+
+    // reads 4 bytes from data
+    function read32Bit(ba, o) {
+      var a = ba[o];
+      var b = ba[o+1];
+      var c = ba[o+2];
+      var d = ba[o+3];
+      var r = (a | ((b << 8) >>> 0) | ((c << 16) >>> 0) | ((d << 24) >>> 0)) >>> 0;
+      return r;
+    }
+
+     // reads 2 bytes from data
+    function read16Bit(ba, o) {
+      var r = ba[o] | (ba[o+1] << 8);
+      return r;
+    }
+
+    // reads 1 byte from data
+    function read8Bit(ba, o) {
+      return ba[o];
+    }
+
+    init();
+  };
+
+  window.BWReader = BWReader;
+})();
