fix for dalliance bigbed format

gistfile1.diff

diff --git a/js/bigwig.js b/js/bigwig.js
index 0e72afa..48157fa 100644
--- a/js/bigwig.js
+++ b/js/bigwig.js
@@ -88,6 +88,7 @@ function BigWigView(bwg, cirTreeOffset, cirTreeLength, isSummary) {
 
 BigWigView.prototype.readWigData = function(chrName, min, max, callback) {
     var chr = this.bwg.chromsToIDs[chrName];
+    console.log(chrName, chr)
     if (chr === undefined) {
         // Not an error because some .bwgs won't have data for all chromosomes.
 
@@ -346,8 +347,8 @@ BigWigView.prototype.readWigDataById = function(chr, min, max, callback) {
                                     var thickStart = bedColumns[3]|0;
                                     var thickEnd   = bedColumns[4]|0;
                                     var blockCount = bedColumns[6]|0;
-                                    var blockStarts = bedColumns[7].split(',');
-                                    var blockEnds = bedColumns[8].split(',');
+                                    var blockSizes = bedColumns[7].split(',');
+                                    var blockStarts = bedColumns[8].split(',');
                                     
                                     featureOpts.type = 'bb-transcript'
                                     var grp = new DASGroup();
@@ -368,8 +369,8 @@ BigWigView.prototype.readWigDataById = function(chr, min, max, callback) {
 
                                     var spans = null;
                                     for (var b = 0; b < blockCount; ++b) {
-                                        var bmin = blockStarts[b]|0;
-                                        var bmax = blockEnds[b]|0;
+                                        var bmin = (blockStarts[b]|0) + start;
+                                        var bmax = bmin + (blockSizes[b]|0);
                                         var span = new Range(bmin, bmax);
                                         if (spans) {
                                             spans = union(spans, span);