function createXmlHttpRequestObjekt()
{
    var obj = null;
    try 
    {
        obj = new ActiveXObject("Microsoft.XMLHTTP");
    }
    catch(ex)
    {
        try 
        {
            obj = new ActiveXObject("MSXML2.XMLHTTP");
        }
        catch(ex)
        {
            try 
            {
                obj = new XMLHttpRequest();
            }
            catch(ex)
            {
                alert("createXmlHttpRequestObjcet: Erzeugung nicht moeglich...");
            }
        }
    }
    return obj;
}