function checkform ( form )
{   
        
  // ** START **
  if (form.Name.value == "") {
    alert( "Please enter your Name." );
    form.Name.focus();
    return false ;
  }
  if (form.Email.value == "") {
    alert( "Please enter your Email." );
    form.Email.focus();
    return false ;
  }
  if (form.Phone.value == "") {
    alert( "Please enter your Phone number." );
    form.Phone.focus();
    return false ;
  }
  if (form.Comment.value == "") {
    alert( "Please enter your Comment." );
    form.Comment.focus();
    return false ;
  }   
  // ** END **
  return true ;
}