function show(datei, name, hoch, breit, scroll)
		{
		var winbreite = (screen.width - breit) / 4;
		var winhoehe = (screen.height - hoch) / 2;
		parameter = 'height='+hoch+',width='+breit+',top='+winhoehe+',left='+winbreite+',scrollbars='+scroll;
		popup = window.open(datei, name, parameter);		
		if (parseInt(navigator.appVersion) >= 4) { popup.window.focus(); }
		}