var IsOpen = false
var Handle;


function openWindow(URL)
    {
    if(!IsOpen || Handle.closed == true) 
        {
        //alert("Open");
        Handle = window.open(URL, "Infofenster", "width=640,height=640,resizable=1,status=0,scrollbars=1,menubar=0");
        IsOpen = true;
        }

    else
        {
        //alert("Focus");
        Handle.focus();
    IsOpen = true;
        }

    }