var xmlhttp=false;
var path = '/';
try {
  xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");
 } catch (e) {
  try {
   xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
  } catch (E) {
   xmlhttp = false;
  }
 }

if (!xmlhttp && typeof XMLHttpRequest!='undefined') {
	try {
		xmlhttp = new XMLHttpRequest();
	} catch (e) {
		xmlhttp=false;
	}
}
if (!xmlhttp && window.createRequest) {
	try {
		xmlhttp = window.createRequest();
	} catch (e) {
		xmlhttp=false;
	}
}

var screen_width = screen.width;


xmlhttp.open("GET", path + "setbackground.aspx?res=" + screen_width  ,true);
 xmlhttp.onreadystatechange=function() {
  if (xmlhttp.readyState==4) {
   document.getElementById("ctl00_back").href=xmlhttp.responseText
  }
 }
 xmlhttp.send(null);