function popupPage(page, breite, hoehe) {
		var oben=screen.height/2-hoehe/2;
		var links=screen.width/2-breite/2 - 12;

		windowprops = "height="+hoehe+",width="+breite+",location=no,scrollbars=no,menubars=no,toolbars=no,resizable=no,left="+links+",top="+oben;

		fenster = window.open(page, "Popup", windowprops);
		fenster.focus();
	}