<script type="text/javascript">

function createRequestObject()
{
var xmlHttp;

if(window.XMLHttpRequest)
{
// Mozilla, Safari, Opera usw...
xmlHttp = new XMLHttpRequest();
}else if(window.ActiveXObject)
{
// IE
xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
}else{
alert("Ihr Webbrowser unterstuetzt leider kein Ajax!");
}

return xmlHttp;
}

window.onbeforeunload = function () {


var xmlHttp = createRequestObject();

// Seite aufrufen
xmlHttp.open(\\'GET\\', \\'login.php?logout\\');

xmlHttp.send(null);

};
</script>