var xmlhttp;
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 setCompair(str,id)
{
    
xmlhttp=GetXmlHttpObject();
if (xmlhttp==null)
  {
  alert ("Your browser does not support XMLHTTP!");
  return;
  }
if(str.checked==false)
    {
var url="setcompair.php";
url=url+"?did="+id;
xmlhttp.onreadystatechange=stateChanged;
xmlhttp.open("GET",url,true);//alert(url);
xmlhttp.send(null);
    }
else{
url="setcompair.php";
url=url+"?cid="+id;
xmlhttp.onreadystatechange=stateChanged;
xmlhttp.open("GET",url,true);//alert(url);
xmlhttp.send(null);
}

}
function stateChanged()
{
if (xmlhttp.readyState==4)
  {
 var error=xmlhttp.responseText;
 if(error=="error")alert ("you have selected more than 4 product");
 if(error==4) self.location="compare_product.php";
  }
}
function getCompair()
{
xmlhttp=GetXmlHttpObject();
if (xmlhttp==null)
  {
  alert ("Your browser does not support XMLHTTP!");
  return;
  }
var url="setcompair.php?check=1";
xmlhttp.onreadystatechange=redirect;
xmlhttp.open("GET",url,true);//alert(url);
xmlhttp.send(null);


}
function redirect()
{
if (xmlhttp.readyState==4)
  {
 var error=xmlhttp.responseText;
if(error=="error")alert("Select at least 2 product.\n Maximum limit of selection is 4 products - Thanks");
else
{
   // alert("DFsdfsdf");
    self.location="compare_product.php";
   // alert("DFsdfsdf");
}
  }
}