Admin Forum:Why hidden?

On Isle of Tune Wiki, I was trying to make different views from using the MonoBook skin or the Wikia skin. I did the div ids "wikia-skin" and "monobook-skin", and in MediaWiki:Wikia.css, I wrote this code to hide the monobook code: And this code for MediaWiki:Monobook.css to hide the wikia skin code: However, when I tried adding ?&useskin=monobook to the end of the url on the main page, no content on the page showed, why does it do that? -- Sam Wang (talk) 09:52, June 20, 2012 (UTC)
 * I see this. 15:16, June 20, 2012 (UTC)