how to restore deleted vk messages

vk_restore_message

// got to vk.im/ page
// copy paste this js to console and run 
// profit

var lastMsgId = parseInt(geByClass('dialogs_row ')[0].className.match(/dialogs_msg(.*)/)[1]);
var lastMsgId = lastMsgId + 10;
for (var i = lastMsgId; i > lastMsgId - 100; i--) {
    var id = i;
    console.log('try restore message: ' + id);
    ajax.post('al_mail.php', {act: 'a_restore', id: i, from: 'im', hash: cur.mark_hash, gid: cur.gid});   
}