var x = screen.width
var y = screen.height
//alert(x + ' X ' + y)
var Resurl = ('ScreenRes.aspx?res=' + x + 'X' + y)
//alert(Resurl)

loadXMLDoc(Resurl)

var xmlhttp
function loadXMLDoc(url)
{
// code for Mozilla, etc.
if (window.XMLHttpRequest)
  {
  xmlhttp=new XMLHttpRequest()
  //xmlhttp.onreadystatechange=xmlhttpChange
  xmlhttp.open("GET",url,true)
  xmlhttp.send(null)
  }
// code for IE
else if (window.ActiveXObject)
  {
  xmlhttp=new ActiveXObject("Microsoft.XMLHTTP")
    if (xmlhttp)
    {
    //xmlhttp.onreadystatechange=xmlhttpChange
    xmlhttp.open("GET",url,true)
    xmlhttp.send()
    }
  }
}