function validateForm( formName )
{
    $('contactus').request({
      onSuccess: function(transport)
      {
        if(transport.responseText.match(/^OK/) != null) {
          alert('Your message has been sent!');
          window.location="index.php";
        } else {
          alert(transport.responseText);
        }

      }
    });

    return false;
}