diff --git a/VQI_GenomeBrowser.js b/VQI_GenomeBrowser.js
index 152108d..d3dcfbf 100755
--- a/VQI_GenomeBrowser.js
+++ b/VQI_GenomeBrowser.js
@@ -850,17 +850,22 @@ function VQI_GenomeBrowser(id, serviceURL) {
                     return offset;//height / 2 + margin + offset
                 })
 
-                addTooltip($(trackScalableGroup.selectAll("rect")
+                addTooltip(trackScalableGroup.selectAll("rect")
                     .filter(function (d) {
-                    return d[indexArray.type] == "cpg";})[0]), name, "cpg");
+                    return d[indexArray.type] == "cpg";}), name, "cpg");
 
-                addTooltip($(trackScalableGroup.selectAll("rect")
+                addTooltip(trackScalableGroup.selectAll("rect")
                     .filter(function (d) {
-                    return d[indexArray.type] == "shore";})[0]), name, "shore");
+                    return d[indexArray.type] == "shore";}), name, "shore");
 
-                addTooltip($(trackScalableGroup.selectAll("rect")
+                addTooltip(trackScalableGroup.selectAll("rect")
                     .filter(function (d) {
-                    return d[indexArray.type] == "shelve";})[0]), name, "shelve");
+                    return d[indexArray.type] == "shelve";}), name, "shelve");
+
+                /*$(trackScalableGroup.selectAll("rect")[0]).mousemove(function(event){
+                    $(this).mouseenter();
+                });*/
+
     }
 
     var addBEDTrack = function (data, name, exons) {
@@ -921,9 +926,9 @@ function VQI_GenomeBrowser(id, serviceURL) {
                 .style("vector-effect", "non-scaling-stroke")
                 .attr("class", "scalable")
                     
-                addTooltip($(trackScalableGroup.selectAll("rect")
+                addTooltip(trackScalableGroup.selectAll("rect")
                         .data(data, function (d) {
-                        return d;})[0]), name, "gene")
+                        return d;}), name, "gene")
 
         if (exons)
         {
@@ -958,9 +963,9 @@ function VQI_GenomeBrowser(id, serviceURL) {
                     .style("vector-effect", "non-scaling-stroke")
                     .attr("class", "scalable")
                     
-                    addTooltip($(trackScalableGroup.selectAll("rect")
+                    addTooltip(trackScalableGroup.selectAll("rect")
                         .data(exons, function (d) {
-                        return d;})[0]), name, "exon")
+                        return d;}), name, "exon")
                     
         }
     }
@@ -992,54 +997,91 @@ function VQI_GenomeBrowser(id, serviceURL) {
                 }
             }
         }
-        selection.qtip({
-            content: {
-                text: function(event, api) {
-                    var min,max;
-                    if(type === "exon"){
-                        min = $( this ).prop("__data__")[0];
-                        max = $( this ).prop("__data__")[1];
-                    }
-                    else
-                    {
-                        min = $( this ).prop("__data__")[indexArray.start];
-                        max = $( this ).prop("__data__")[indexArray.end];
-                    }
-                    return $.ajax({
-                        url: serviceURL,
-                        type: 'POST',
-                        dataType: "json",
-                        data: {
-                            "loadTooltip": "",
-                            "chrom": chrom_curr,
-                            "trackName" : name,
-                            "type" : type,
-                            "min" : min,
-                            "max": max,
-                            'fileHandle': fileHandle
+        selection.each(
+            function(d){
+                $(this).qtip({
+                    content: {
+                        text: function(event, api) {
+                            var min,max;
+                            if(type === "exon"){
+                                min = d[0];
+                                max = d[1];
+                            }
+                            else
+                            {
+                                min = d[indexArray.start];
+                                max = d[indexArray.end];
+                            }
+                            $.ajax({
+                                url: serviceURL,
+                                type: 'POST',
+                                dataType: "json",
+                                data: {
+                                    "loadTooltip": "",
+                                    "chrom": chrom_curr,
+                                    "trackName" : name,
+                                    "type" : type,
+                                    "min" : min,
+                                    "max": max,
+                                    'fileHandle': fileHandle
+                                }
+                            })
+                            .then(function(content) {
+                                // Set the tooltip content upon successful retrieval
+                                api.set('content.text', content);
+                            }, function(xhr, status, error) {
+                                // Upon failure... set the tooltip content to the status and error value
+                                api.set('content.text', status + ': ' + error);
+                            });
+
                         }
-                    })
-                    .then(function(content) {
-                        // Set the tooltip content upon successful retrieval
-                        return content;
-                    }, function(xhr, status, error) {
-                        // Upon failure... set the tooltip content to the status and error value
-                        api.set('content.text', status + ': ' + error);
-                    });
+                    },
+                    position: {
+                        my: 'top center',
+                        at: 'top center',
+                      target: 'mouse',
+                      adjust: {
+                         mouse: true,  // Can be omitted (e.g. default behaviour)
+                         y: 10
+                      }
+                    }
+                })
+            });
 
-                }
-            },
-            position: {
-                my: 'top center',
-                at: 'top center',
-              target: 'mouse',
-              adjust: {
-                 mouse: true,  // Can be omitted (e.g. default behaviour)
-                 y: 10
-              }
-           }
-        });
-    }
+            selection.each(function(){
+                var selected = $(this);
+                var hoverTimeout = 0;
+                $(this).mousemove(function(event) {
+                    clearTimeout(hoverTimeout);
+                    hoverTimeout = setTimeout(function(){
+                        var pixelWidth = (xScale.domain()[1] - xScale.domain()[0])/1000
+                        var min = (event.pageX - 59) * pixelWidth + xScale.domain()[0];
+                        var max = (event.pageX - 58) * pixelWidth + xScale.domain()[0];
+                        $.ajax({
+                            url: serviceURL,
+                            type: 'POST',
+                            dataType: "json",
+                            data: {
+                                "loadTooltip": "",
+                                "chrom": chrom_curr,
+                                "trackName" : name,
+                                "type" : type,
+                                "min" : min,
+                                "max": max,
+                                'fileHandle': fileHandle
+                            }
+                        })
+                        .then(function(content) {
+                            // Set the tooltip content upon successful retrieval
+                            selected.qtip('option', 'content.text', content);
+                        }, function(xhr, status, error) {
+                            // Upon failure... set the tooltip content to the status and error value
+                            selected.qtip('option', 'content.text', status + ': ' + error);
+                        });
+                    } , 200);
+                });
+            });
+}
 
      this.addTrackFromDatabase = function(){
         var chrom = "chr1";