function PopUp(popupURL,windowname,height,width,top,left) {
    window.open(popupURL,windowname,"toolbar=0,location=0,directories=0,status=0,menubar=0,scrollbars=yes,resizable=no,width=" + width + ",height=" + height + ",screenX=" + left + ",screenY=" + top);
}

function shownav(objID) {

   document.getElementById('nav_sanitaetshaus').style.display='none';
   document.getElementById('nav_rehatechnik').style.display='none';
   document.getElementById('nav_werkstatt').style.display='none';
   // document.getElementById('nav_service').style.display='none';
 	
   document.getElementById(objID).style.display='block';
}

// <script>emaillink('beispieldomain.tld','info');</script>
function emaillink(suffix, prefix) {
    var l = prefix + '@' + suffix;
    var p = '<a href="' + 'mai' + 'lto:' + l + '">';
    var p2 = '</a>';
    document.write(p + l + p2);
}