var script = "/beheer/access/client.php?width="+screen.width+"&height="+screen.height
var xhr = ajax()
if (typeof(xhr) != "undefined")
{ xhr.open("post",script,true)
  xhr.send("")
}
else
{ img = new Image()
  img.src = script
}

function ajax()
{ try {return new XMLHttpRequest()} catch(e) {}
  try {return new ActiveXObject("Msxml2.XMLHTTP.6.0")} catch(e) {}
  try {return new ActiveXObject("Msxml2.XMLHTTP.3.0")} catch(e) {}
  try {return new ActiveXObject("Msxml2.XMLHTTP")} catch(e) {}
  try {return new ActiveXObject("Microsoft.XMLHTTP")} catch(e) {}
}