function openWindow(url,name, breite, hoehe) {
	// Errechnet Koordinaten, um das Popup zentriert zu platzieren
	  links = (screen.width/2)-(breite/2);
	  oben = (screen.height/2)-(hoehe/2);
	  window.open(url,name,"height="+hoehe+",width="+breite+",status = no,toolbar = no,menubar = no,location = no,resizable = no,titlebar = no,scrollbars = no,fullscreen = no,top ="+oben+",left ="+links);
}