function verifyCode()
{
            
            xmlhttp=new XMLHttpRequest();
            xmlhttp.onreadystatechange=function()
              {
              if (xmlhttp.readyState==4 && xmlhttp.status==200)
                        {
                                   if (xmlhttp.responseText == "false") 
                                   {
                                      alert("Der eingegebene Aktionscode ist nicht korrekt.");
                                      return false;
                                   } else {
                                      document.Aktionscode.submit();
                                   } 
                        }
              }
              xmlhttp.open("GET","/verifyCode.php?ac=" + document.getElementById("ac").value ,true);
              xmlhttp.setRequestHeader("Pragma", "no-cache");
              xmlhttp.setRequestHeader("Cache-Control", "must-revalidate");
              xmlhttp.setRequestHeader("If-Modified-Since", document.lastModified);
              xmlhttp.send();
              return false;
}

function testalert () {
  alert ("test");
  alert(document.getElementById("ac").value + "jens");
}