function setLabelClass(elems,idFor,newClass)
{
  for(j=0;j<elems.length;j++)
  {
    if(elems[j].getAttribute('for','false') == idFor|| elems[j].getAttribute('htmlfor','false') == idFor)
    {
      elems[j].className = newClass;
    }
  }
}

function dealFormError(form, missingFields, wrongEmails, wrongPassword){
  
  /* This function highlights the missing mandatory fields and their label */
  var labels = document.getElementsByTagName('label');
  var wrongFields = missingFields.concat(wrongEmails);
  
 
  //  reset the styles of the form-elements.
  if(self.oldFields){
    for(i=0;i<oldFields.length;i++){
      form[oldFields[i]].className = oldClasses[i];
      setLabelClass(labels,oldFields[i],"");
    }
  }

  if(wrongFields.length>0)
  {
    oldFields = new Array();
    oldClasses = new Array();
    for(i=0;i<wrongFields.length;i++)
    {
      oldFields.push(wrongFields[i]);
      oldClasses.push(form[wrongFields[i]].className);
      form[wrongFields[i]].className = form[wrongFields[i]].className + " " + "formError";
      setLabelClass(labels,wrongFields[i],"formError");
    }
  }
    
  msg = "Het formulier kon niet verstuurd worden.";
  if(missingFields.length>0){
    msg += "\nVul aub alle verplichte velden in.";
  }
  if(wrongEmails.length>0){
    msg += "\nGeef een correct e-mail adres op.";
  }
  if(wrongPassword){
    msg += "\nEen wachtwoord moet minimaal uit 4 karakters bestaan.";
  }
  alert(msg);
}