Number of posts before access of page

[calorie]

Untested but try placing the following right after you include the vB global.php file:

$fivepost_check = $db->query_first("SELECT COUNT(1) AS cnt
	FROM " . TABLE_PREFIX . "post
	WHERE userid = " . $vbulletin->userinfo['userid'] . "
	AND dateline > " . TIMENOW . " - 86400
");

if ($fivepost_check['cnt'] < 5)
{
	print_no_permission();
}