function validateForm(pform) {
  var tmpelement=document.getElementById('requestform').elements;
  for (var i=0; i<tmpelement.length; i++) {
    var element = tmpelement[i];
    if (element.className == "required") {
       if (!isFilled(element)) {
        alert("Please complete all required fields (indicated by *)");
        return false;
      }
    }
  }
  return true;
}

function isFilled(field) {
  if (field.value.length < 1) {
    return false;
  } else {
    return true;
  }
}