function openPicture(url, width, height)
{ 
	width = width + 38;
	height = height + 38;
	var LeftPosition = (screen.width) ? (screen.width-width)/2 : 0;
	var TopPosition = (screen.height) ? (screen.height-height)/2 : 0;
	var settings = 'height='+height+',width='+width+',top='+TopPosition+',left='+LeftPosition+',scrollbars=no,resizable=no,status=no';
	var Fenster = window.open(url, 'ZumRiesling', settings);
	return false; 
}