function openKontakt(url) {
 xPos = (screen.availWidth/2-400);
 yPos = (screen.availHeight/2-300);
 kontaktwindow = window.open(
url
,"kontaktformwindow","width=430,height=520,resizable=no,scrollbars=yes,location=yes,directories=no,status=no,menubar=no,toolbar=no");
 kontaktwindow.focus();
}