var xmlhttp

function addThis(productid, add, sid)
{
xmlhttp=GetXmlHttpObject();
if (xmlhttp==null)
  {
  alert ("Your browser does not support XMLHTTP!");
  return;
  }
var url="/select.php";
url=url+"?id="+productid;
url=url+"&action="+add;
url=url+"&sid="+sid;
xmlhttp.onreadystatechange=function () {
myStateChanged(productid, add);
};
xmlhttp.open("GET",url,true);
xmlhttp.send(null);
}


function GetXmlHttpObject()
{
if (window.XMLHttpRequest)
  {
  // code for IE7+, Firefox, Chrome, Opera, Safari
  return new XMLHttpRequest();
  }
if (window.ActiveXObject)
  {
  // code for IE6, IE5
  return new ActiveXObject("Microsoft.XMLHTTP");
  }
return null;
}


function myStateChanged(productid, add)
{
if (xmlhttp.readyState==4)
  {
   document.getElementById(productid).innerHTML=xmlhttp.responseText;
  }
}