member-header who is online

<?php
global $bp;
function check_is_user_online($user_id){
if ( bp_has_members( 'type=online&include='.$user_id) ) return true;
else return false;
}
$this_id = bp_displayed_user_id();
$is_online = check_is_user_online($this_id);
if ($is_online) echo "Now Online";
else{ echo "Offline";}

?>