<script type="text/javascript">

function window.onbeforeunload()

{

  var xmlHttp;

  try

  {

    // Firefox, Opera 8.0+, Safari

    xmlHttp=new XMLHttpRequest();

  }

  catch (e)

  {

    // Internet Explorer

  try

  {

    xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");

  }

  catch (e)

  {

    try

    {

      xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");

    }

    catch (e)

    {

      alert("Your browser does not support AJAX!");

      return false;

    }

  }

  if (event.clientX>document.body.clientWidth&&event.c lientY<0||event.altKey)

  {

    xmlhttp.open("GET","exit.aspx",false);

    xmlhttp.send();

  }

 }

</script>