function checkEmpty(field) {
 var fields = document.getElementsByName(field);
 var item = fields != null ? fields[0] : null;
 if (item != null) {
   if (item.value == "") {return false;} else {return true;}
 } else {
   return false;
 }
}

function isValidEmail(str) {
  return (str.indexOf(".") > 0) && (str.indexOf("@") > 0);
}
function validateForm(form) {
  var l = requiredFields.length;
  var i=0;
  var emailRequired = 0;
  for (i=0; i<l; i++) {
    var field = requiredFields[i];
    if (field == 'Epost') {
        emailRequired = 1;
    }
    if (!checkEmpty(field)) {
      var msg = "Vennligst fyll ut det obligatoriske feltet ";
      alert(msg + field);
      return false;
    }
  }

  if (emailRequired && !isValidEmail(document.getElementsByName("Epost")[0].value)) {
    alert("Ugyldig epost-adresse."); return false;
  }

form.submit();
return false;
}