/**
 * Javascript to examine the contact form for field values.
 * Language used in this script: German.
 */
function checkForm(form) {
  if (form.name.value == '') {
    alert("Please enter your name!");
    form.name.focus();
    return false;
  }
  if (form.subject.value == '') {
    alert("Please enter the reason for your contact request!");
    form.subject.focus();
    return false;
  }
  if (form.telephon.value != '') { return true; }
  if (form.telefax.value != '') { return true; }
  if (form.email.value != '') {
    if ((form.email.value.indexOf("@")) == -1) {
      alert("The email address you entered is not valid. Please give us a valid email address!");
      form.email.value = '';
      form.email.focus();
      return false;
    }
    return true;
  }
  alert("Please state your contact preference!");
  form.telephon.focus();
  return false;
}