function popUp(theURL,winName,features)
{
var winl = (screen.width - 790)/2;
var wint = (screen.height - 600)/2;
meinfenster=window.open(theURL,"Fenster",'top='+wint+',left='+winl+',toolbar=no,loction=no,directories=no,statusbar=no,menubar=no,scrollbars=yes,resizable=no,width=790,height=600');
meinfenster.focus();
}