Allow bots / spiders / crawlers into your private vbulletin forums

There are some very complicated hacks to add but this one line script to do it.
This should be applied to VB 3.5.4
add these lines to the end of your init.php file located in forumroot\includes\init.php

Get Keyword from referrer

This Function should extract the keyword from the referrer URL to get what your visitor was searching for on google, msn, live, altavista, alltheweb, scirus, aol, vivisimo, lycos, aliweb, yahoo and baidu.