<!-- 
function winOpen(url, breite, hoehe) {    
   links = (screen.width/2)-(breite/2);
   oben = (screen.height/2)-(hoehe/2);
   window.open(url,"popup","height="+hoehe+",width="+breite+",status = no,toolbar = no,menubar = no,location = no,resizable = no,titlebar = no,scrollbars = no,fullscreen = no,top ="+oben+",left ="+links);
}