function insComma(data)
{
   var count = i = 0;
   var tmpStr = "";
   var comma = ",";

   for (i = data.length-1; i >= 0; i--) 
   {
      if (count == 3)
      {
         tmpStr = comma + tmpStr;
         count = 1;
      }
      else
         count ++;
      tmpStr = data.charAt(i) + tmpStr;
      //alert('tmpStr=' + tmpStr);
   }
   return (tmpStr);
}