function showit(dateiname,b,h)
			{
			var eigenschaft,sbreite,shoehe,fenster;
		
		
			sbreite = screen.width;
			shoehe = screen.height;
		
		
			x = (sbreite-b)/2;
			y = (shoehe-h)/2;
		
		
			eigenschaften="left="+x+",top="+y+",screenX="+x+",screenY="+y+",width="+b+",height="+h+",menubar=no,toolbar=no";
		
			fenster=window.open(dateiname,"Titel",eigenschaften);
			fenster.focus();
			}