function popup(url,name,breit,hoch,scroll,menubar) {
	links = (screen.width/2)-(breit/2);
	oben = (screen.height/2)-(hoch/2);
	fenster=window.open(url,name,'width='+breit+',height='+hoch+',toolbar=no,location=no,directories=no,status=no,menubar='+menubar+',scrollbars='+scroll+',resizable=no,top ='+oben+',left ='+links);
	fenster.focus();
}