heartbeat ajax on node's not working

Hey Jochen,

me again! I found out why ajax for nodes isn't working:
// activitycomments_node is always empty
$node_comment = isset($_POST['activitycomments_node']) ? $_POST['activitycomments_node']: 0;
// it's mean to use code like this :p I had to ask someone what this is doing.
$node_comment = (int) ($node_comment && $nid);

Nevermind! I attached a patch but i couldn't test if it breaks loading heartbeat messages instead of node comments so please have a good at it.

kind regards
Volkan