function popup(url,breite,hoehe,name,resize){
        if(!breite){
                 breite=320;
        }
        if(!hoehe){
                hoehe=250;
        }
        if(!name){
                name= "fruchtsaftbaeren_fenster";
        }
		if (!resize) {
				resize="yes";
		}
        userfenster=window.open(url,name,"width="+breite+",height="+hoehe+",screenX=0,screenY=0,resizable="+resize+",scrollbars=no");
        userfenster.focus();
}