Can anybody tell me how to insert notification message ?

function send_note($id,$msg)

Thanks falcone.

function send_note($id,$msg) ? w's name of file

when make this ?
send_note funzione ($ id, $ msg)

function send_note($id, $msg) {
global $client;
if ($client['id'] == $id)
return false;
$note['message'] = $msg;
$note['created'] = time();
$note['to_id'] = $id;
sql_insert($note,tb().'messages');
}
includes/libs/common_inc.php