diff --git a/heatcalc/heatcalc.js b/heatcalc/heatcalc.js
index 82a8159..d021260 100644
--- a/heatcalc/heatcalc.js
+++ b/heatcalc/heatcalc.js
@@ -188,7 +188,12 @@ function draw_table(){
     // display the table
     $("#table_container").append(table);
 
-    $("#hc_table thead").clone().css('position','fixed').prependTo("#hc_table");
+    //clon the thead
+    var org_thead=$("#hc_table thead");
+    org_thead.clone().attr('id','floater').css('position','fixed').prependTo("#hc_table");
+    org_thead.find('tr').first().children().each(function(i, e){
+        $($("#hc_table thead#floater").find('tr').children()[i]).width($(e).width());
+    });
 
     //enable highlighting
     $("#hc_table td").on("mouseover", function() {