function chkRecommend () {
  if (document.Recommend.titel.value == "") {
    alert("Input title");
    document.Recommend.titel.focus();
    return false;
  }
  if (document.Recommend.link.value == "") {
    alert("Input link");
    document.Recommend.link.focus();
    return false;
  }
  if (document.Recommend.description.value == "") {
    alert("Input text");
    document.Recommend.description.focus();
    return false;
  }
}