Проверка полей формы авторизации на HTML5

function get_url($id) {
	global $cat_info;
	
	if( !$id ) return;
	
	$parent_id = $cat_info[$id]['parentid'];

	...
	...
	
	return $url;
}

		$row['category'] = intval( $row['category'] );

		$tpl->set( '{parent-category}', get_parent_category($row['category']) );

$parent_id = $cat_info[$category_id]['parentid'];
$tpl->set( '{parent-category}', $cat_info[$parent_id]['name'] );