wowhead tooltips world of warcraft wow items

Hello,
as you know WowHead.com starts to provide its own tooltips system based on JavaScrips. What to do to get this unbelievable useful feature on your guild website?

First, I visited http://www.wowhead.com/tooltips, learn a bit about syntax. I thought that best location for this script will be node.module file, just right at beginning of the file, so next I made back up of node.module file (YOUR_WEBSITE_ADDRESS/modules/node/node.module, changed its name to exp. node_.module), edited node.module in some editor (exp. Notepad from Windows) and before first "<?php" mark I added: