function addLoadEvent(func) {
  var oldonload = window.onload;
  if (typeof window.onload != 'function') {
    window.onload = func;
  } else {
    window.onload = function() {
      oldonload();
      func();
    }
  }
}

function clearloginfields() {
 if ((document.getElementById("loginid").value == "Benutzername") && (document.getElementById("password").value == "Passwort")) {
  document.getElementById("loginid").value = "";
  document.getElementById("password").value = "";
 }
}