function checkform ( form )
{
  // see http://www.thesitewizard.com/archive/validation.shtml
  // for an explanation of this script and how to use it on your
  // own website
  
  if (form.Name.value == "") {
    alert( "Please enter your name." );
    form.Name.focus();
    return false ;
  }
 
  if (form.email.value == "") {
    alert( "Please enter your email address." );
    form.email.focus();
    return false ;

  }
    if (form.PhoneNumber.value == "") {
    alert( "Please enter your Phone Number." );
    form.PhoneNumber.focus();
    return false ;

  }
     if (form.Message.value == "") {
    alert( "Please enter your Message." );
    form.Message.focus();
    return false ;

  }
  // ** END **

  return true ;
}