var xmlhttp;
function clicktrack(tid)
{
xmlhttp=null;
var url = "/rainbow/clicktrack.asp?tid="+tid;
if (window.XMLHttpRequest)
  {// code for all new browsers
  xmlhttp=new XMLHttpRequest();
  }
else if (window.ActiveXObject)
  {// code for IE5 and IE6
  xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
  }
if (xmlhttp!=null)
  {
  xmlhttp.open("GET",url,false);
  xmlhttp.send(null);
  }
else
  {
  // alert("Your browser does not support XMLHTTP.");
  }
}