diff --git a/VQI_GenomeBrowser.js b/VQI_GenomeBrowser.js
index b10d18b..cd3ddca 100755
--- a/VQI_GenomeBrowser.js
+++ b/VQI_GenomeBrowser.js
@@ -73,7 +73,7 @@ function VQI_GenomeBrowser(id, serviceURL) {
         for (i in trackInfo){
 
             if (trackInfo[i].name == track){
-                self.addTrack([] , track , trackInfo[i].type , trackInfo[i].args);
+                self.addTrack(track[i].name , trackInfo[i].type , trackInfo[i].args);
                 break;
             }           
         }
@@ -227,7 +227,6 @@ function VQI_GenomeBrowser(id, serviceURL) {
             },
             async: true
         }).success(function (data) {
-            console.log(data);
             $("#pvalue_div").empty().append("p-value = " + data);
         }).error(function (req, status, error) {
             $("body").append(status + ": " + error);
@@ -711,7 +710,6 @@ function VQI_GenomeBrowser(id, serviceURL) {
         selectBox.options.length = 0;
         var optionIndex = 0;
         for (var key in genomes) {
-            console.log(key)
             var text = key;
             var value = key;
             selectBox.options[optionIndex++] = new Option(text, value);
@@ -751,7 +749,6 @@ function VQI_GenomeBrowser(id, serviceURL) {
             for(var key in genomes[genome])
             {
                 this.addTrack(genome+"_"+key, key, genomes[genome][key])
-                // console.log(genomes[genome][key]);
             }
         }
     }
@@ -769,7 +766,6 @@ function VQI_GenomeBrowser(id, serviceURL) {
             }
             
             }).success(function (returnData) {
-                console.log(returnData);
             }
             ).error(function (req, status, error) {
                 $("body").append(status + ": " + error);
@@ -1237,7 +1233,6 @@ function VQI_GenomeBrowser(id, serviceURL) {
                 }
                 
                 }).success(function (returnData) {
-                    // console.log(returnData);
                     drawTrack(returnData);
                     LoadingText.remove();
                 }
@@ -1290,7 +1285,7 @@ function VQI_GenomeBrowser(id, serviceURL) {
                 async : false,
                 data: {
                     "getRange": "",
-                    "fileHandles": [fileHandle],
+                    "fileHandle": fileHandle,
                     "type": "cpg",
                     "chrom": chrom_curr
                 }
@@ -1372,19 +1367,13 @@ function VQI_GenomeBrowser(id, serviceURL) {
 
             if (exons)
             {
-                trackGroup.selectAll("rect")
-                        .data(data, function (d) {
-                            return d;
-                        })
-                        .exit()
-                        .remove();
-
                 trackGroup.selectAll("rect")
                         .data(exons, function (d) {
                             return d;
                         })
                         .enter()
                         .append("rect");
+                        
                 trackGroup.selectAll("rect")
                         .data(exons, function (d) {
                             return d;
@@ -1503,7 +1492,6 @@ function VQI_GenomeBrowser(id, serviceURL) {
                 }
                 
                 }).success(function (returnData) {
-                    // console.log(returnData);
                     if(returnData.length == 2) {//exons exist
                         
                         drawTrack(returnData[0], returnData[1]);
@@ -1563,7 +1551,6 @@ function VQI_GenomeBrowser(id, serviceURL) {
                 }
             }).success(function (returnData) {
                 data = returnData;
-                console.log(returnData);
                 data.unshift(["CHROM","CHROM_START","CHROM_END","GENESYMBOL","SCORE","STRAND"]);
             }).error(function (req, status, error) {
                 $("body").append(status + ": " + error);
@@ -1581,7 +1568,7 @@ function VQI_GenomeBrowser(id, serviceURL) {
                 async : false,
                 data: {
                     "getRange": "",
-                    "fileHandles": [fileHandle],
+                    "fileHandle": fileHandle,
                     "type": "gene",
                     "chrom": chrom_curr
                 }
@@ -1815,7 +1802,6 @@ function VQI_GenomeBrowser(id, serviceURL) {
                 }
             }).success(function (returnData) {
                 data = returnData;
-                console.log(returnData);
                 data.unshift(["CHROM","CHROM_START","CHROM_END","GENESYMBOL","SCORE","STRAND"]);
             }).error(function (req, status, error) {
                 $("body").append(status + ": " + error);
@@ -1833,7 +1819,7 @@ function VQI_GenomeBrowser(id, serviceURL) {
                 async : false,
                 data: {
                     "getRange": "",
-                    "fileHandles": [fileHandle],
+                    "fileHandle": fileHandle,
                     "type": "custom",
                     "chrom": chrom_curr
                 }
diff --git a/VQI_GenomeBrowserDemo.html b/VQI_GenomeBrowserDemo.html
index fe51f76..718d021 100644
--- a/VQI_GenomeBrowserDemo.html
+++ b/VQI_GenomeBrowserDemo.html
@@ -49,7 +49,7 @@
                         genes: {file: "hg19_refgene.txt", table_name: "hg19_refgene"},
                         cpg: {file: "cpg_site_hg19.txt,shelve_hg19.txt,shoer_hg19.txt", table_name: "cpg_site_hg19,shelve_hg19,shoer_hg19"},
                         //custom: {file: "", table_name:'upload1436411775'}
-                    },
+                    }
             //         "MM9":{
             //             fasta: {fasta: "/Users/corywang/Downloads/mm9.fa.txt", index: "/Users/corywang/Downloads/mm9.fa.fai.txt"},
             //             //genes: {file: "../../genome/mm9/mm9_genes.txt", table_name:'mm9_gene_annotation'},
diff --git a/dynamic_loading.php b/dynamic_loading.php
index cc4c9e2..de38178 100644
--- a/dynamic_loading.php
+++ b/dynamic_loading.php
@@ -1,22 +1,22 @@
 <?php
     //set content type and xml tag
-	header("Content-type: text/xml");
-	
-	/**************************/
-	// replace these information if needed
-	$db_name = "test";
-	$table_name = "";
-	$host_name = "localhost";
-	$user_name = "root";
-	$password = "";
+    header("Content-type: text/xml");
+    
+    /**************************/
+    // replace these information if needed
+    $db_name = "test";
+    $table_name = "";
+    $host_name = "localhost";
+    $user_name = "root";
+    $password = "";
     $DBlink = mysqli_connect($host_name, $user_name, $password);
     $currentRow = 0;
 
-	/***************************/
+    /***************************/
 
 
 
-	if (isset($_POST["upload"])){
+    if (isset($_POST["upload"])){
         $timestamp = (new DateTime())->getTimestamp();
         $data = parseData($_POST["upload"]);
         if(isset($_POST["tableName"])){
@@ -54,7 +54,7 @@
         ajaxReturn($result);
     }
     else if (isset($_POST["getRange"])){
-        $result = getRange($_POST["fileHandles"], $_POST["type"], $_POST["chrom"]);
+        $result = getRange($_POST["fileHandle"], $_POST["type"], $_POST["chrom"]);
         ajaxReturn($result);
     }
     else if (isset($_POST["loadTooltip"])){
@@ -305,8 +305,8 @@
     }
 
     function mergeExons($geneStart, $geneEnd, $Exstart, $Exend, $start,$end, $scale){
-        $ExStartArray = explode(",",substr($Exstart,0,-1));
-        $ExEndArray = explode(",",substr($Exend,0,-1));
+        $ExStartArray = explode(",",trim($Exstart, '"'));
+        $ExEndArray = explode(",",trim($Exend, '"'));
 
         if ($geneEnd-$geneStart < 1/$scale){
 
@@ -587,7 +587,7 @@
         return $returnArray;
     }
 
-    function getRange($fileHandles,$type,$chrom){
+    function getRange($fileHandle,$type,$chrom){
         $db_name = $GLOBALS['db_name'];
         $link = $GLOBALS['DBlink'];
         
@@ -598,8 +598,6 @@
         $sql .= " ORDER BY `CHROM_START` * 1 ASC";
 
             # code...
-        $fileHandle = $value;
-
         $minsql = "SELECT `CHROM`, `CHROM_START`, `CHROM_END`, `GENESYMBOL`, `SCORE` FROM {$db_name}.{$fileHandle} ORDER BY `CHROM_START` * 1 ASC LIMIT 1";
         if ($type == "gene"){
             $minsql = "SELECT `chrom`, `txStart`, `txEnd`, `name2`, `score` FROM {$db_name}.{$fileHandle} ORDER BY `txStart` * 1 ASC LIMIT 1";
@@ -923,7 +921,7 @@
                 $table_name = $_GET["tableRef"];
             }
         }
-		if(isset($_GET["posStart"]))
+        if(isset($_GET["posStart"]))
             $posStart = $_GET['posStart'];
         else
             $posStart = 0;
@@ -932,35 +930,35 @@
         else
             $count = 100;
 
-		$currentRow = $posStart;
-		$totalCount = 0;
+        $currentRow = $posStart;
+        $totalCount = 0;
         //connect to database
         $link = mysqli_connect($host_name, $user_name, $password);
         //$db = mysqli_select_db ("test");
         
         //create query to products table
         $sql = "SELECT  * FROM {$db_name}.{$table_name}";
-		
-		//if this is the first query - get total number of records in the query result
-		if($posStart==0){
+        
+        //if this is the first query - get total number of records in the query result
+        if($posStart==0){
             $sqlCount = "Select count(*) as cnt from ($sql) as tbl";
             $resCount = mysqli_query ($link,$sqlCount);
             $rowCount=mysqli_fetch_assoc($resCount);
             $totalCount = $rowCount["cnt"];
         }
-		
-		if(isset($_GET["name_mask"]) && isset($_GET["filter_attribute"])){
-			$p = $_GET['filter_attribute'];
-			$sql.=" Where {$p} = '".$_GET["name_mask"]."'";
+        
+        if(isset($_GET["name_mask"]) && isset($_GET["filter_attribute"])){
+            $p = $_GET['filter_attribute'];
+            $sql.=" Where {$p} = '".$_GET["name_mask"]."'";
 
             $sqlCount = "Select count(*) as cnt from ($sql) as tbl";
             $resCount = mysqli_query ($link,$sqlCount);
             $rowCount=mysqli_fetch_assoc($resCount);
             $totalCount = $rowCount["cnt"];
-		}
-		if (isset($_GET["order"]) && isset($_GET["sort_attribute"])){
-			$order = $_GET['order'];
-			$sort_attribute = $_GET['sort_attribute'];
+        }
+        if (isset($_GET["order"]) && isset($_GET["sort_attribute"])){
+            $order = $_GET['order'];
+            $sort_attribute = $_GET['sort_attribute'];
             $ifNumeric = "SELECT `".$sort_attribute."` FROM {$db_name}.{$table_name} LIMIT 1";
             $res = mysqli_query ($link, $ifNumeric);
             $resArray = mysqli_fetch_row($res);
@@ -970,8 +968,8 @@
             else {
                 $sql.=" ORDER BY $sort_attribute $order";
             }
-			
-		}
+            
+        }
 
         //add limits to query to get only rows necessary for the output
         $sql.= " LIMIT ".$posStart.",".$count;
@@ -995,13 +993,13 @@
     //             print("<cell>");
     //                 print($row[3]);    
     //             print("</cell>");
-				// print("<cell>");
+                // print("<cell>");
     //                 print($row[4]);    
     //             print("</cell>");
-				// print("<cell>");
+                // print("<cell>");
     //                 print($row[5]);    
     //             print("</cell>");
-				// print("<cell>");
+                // print("<cell>");
     //                 print($row[6]);    
     //             print("</cell>");
                 foreach ($row as $key=>$title){
@@ -1013,5 +1011,5 @@
         }
         print("</rows>");
     }
-		
+        
 ?>
\ No newline at end of file