function fenster(url, width, height)
{
	options = "toolbar=no,location=no,status=yes,menubar=no,scrollbars=yes,resizable=yes,width="+width+",height="+height+",left="+((screen.width-width)/2)+",top="+((screen.height-height)/2);
	F1 = open(url,"kis_fenster", options);
	return F1;
}