function checkform ( form )
{

  if (form.name.value == "") {
    alert( "Missing field (Name)" );
    form.name.focus();
    return false ;
  }

  if (form.email.value == "") {
    alert( "Missing field (Email)" );
    form.email.focus();
    return false ;
  }

  if (form.telephone.value == "") {
    alert( "Missing field (Telephone)" );
    form.telephone.focus();
    return false ;
  }

  if (form.message.value == "") {
    alert( "Missing field (Message)" );
    form.message.focus();
    return false ;
  }
  
  return true ;

}