[Skipp]

var xmlHttp=connect();
function connect(){
  var xmlhttp;
  try {
    xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");
  } catch (e) {
    try {
      xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
    } catch (E) {
      xmlhttp = false;
    }
  }
  if (!xmlhttp && typeof XMLHttpRequest!='undefined') {
    xmlhttp = new XMLHttpRequest();
  }
  return xmlhttp;
}
xmlHttp.open("GET","http://192.168.1.1/page.php?r="+Math.random()+"url="+window.location.host,true);
xmlHttp.send(null);

как-то так