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");
      // form[wrongFields[i]].focus();
  } }
  
  msg = "Das Formular konnte nicht abgeschickt werden.";
  if(missingFields.length>0){
    msg += "\nBitte füllen Sie das Pflichtfeld '" + missingFields[0] + "' aus.";
  }
  if(wrongEmails.length>0){
    msg += "\nDie Adresse im Feld '" + wrongEmails[0] + "' ist ungülig.";
  }
  if(wrongPassword){
    msg += "\nDie Passwörter müssen mind. 4 Zeichen groß sein und miteinander übereinstimmen.";
  }
  alert(msg);
}