function mail(lang) {
if (lang==1) {
 fenster=window.open("mail/mail_r.htm", "proba","copyhistory=no,location=no,toolbar=no,scrollbars=no,resizable=no,status=no,width=400,height=500");
 fenster.focus();
 return false;
 }
else if (lang==2) {
 fenster=window.open("mail/mail_u.htm", "proba","copyhistory=no,location=no,toolbar=no,scrollbars=no,resizable=no,status=no,width=400,height=500");
 fenster.focus();
 return false;
 }
else {
 fenster=window.open("mail/mail_e.htm", "proba","copyhistory=no,location=no,toolbar=no,scrollbars=no,resizable=no,status=no,width=400,height=500");
 fenster.focus();
 return false;
 }
}