Forum:Execute Javascript in Special:Chat for all users?

Hi everyone, I'm looking to be able to include some javascript on the Special:Chat page of one of the wikis I am on. I tried including the code in "MediaWiki:Wikia.js", but that code doesn't seem to be included on the "Special:Chat" page at all. I've seen some people who have executed code located at "MediaWiki:Chat.js", but I can't seem to get that to actually execute on the page.

Does anyone have any insight into a way I might be able to get this to work? User:Gamedezyner 15:42, July 19, 2012 (UTC)
 * See the method described by Joeytje50, skipping the CSS parts.TK-999 (talk) 15:51, July 19, 2012 (UTC)