function Form1_Validator(theForm)
{

  if (theForm.contactpersoon.value == "")
  {
    alert("Gelieve de contactpersoon in te vullen.");
    theForm.contactpersoon.focus();
    return (false);
  }

  if (theForm.telefoon.value == "")
  {
    alert("Gelieve uw tel nr in te vullen.");
    theForm.telefoon.focus();
    return (false);
  }

    return (true);
}