/*
  Contact form validation should be used with form.js like:
  <script src="contact.js" type="text/javascript"><!-- MSIE needs this --></script>
  <script src="forms.js" type="text/javascript"><!-- MSIE needs this --></script>
  <form onsubmit="return checkContact(this)" action="contact.jsp" method="post">
*/

function checkContact(formulier) {
  var msg = "";

  if (formulier.email) {
    if (hasInput(formulier.email)) {
      if (!emailCheck(formulier.email.value)) {
        msg += "'" + formulier.email.value + "' is geen gelding e-mail adres. Vul s.v.p. een geldig email-adres in.\n";
      }
    } else {
        msg += "Er is geen e-mail adres ingevuld.\n";
    }
  }

  if (formulier.bericht) {
    if (!hasInput(formulier.bericht)) {
      msg += "Er is geen bericht geschreven.\n";
    }
  }

  if(msg) {
      alert(msg);
      return false;
  }
}