MediaWiki/variable logos

Hello, I have recently customize a style sheet for my wiki, and would love to be able to change out the logo dependant on some property set on the page, the category perhaps. However I have no idea how to do this, and lack the programming skills to try. If anyone knows how to do this, I would be willing to pay (via paypal) anyone that knows how to do this.

My email address is lara@sanctuaryshard.com, please include the cost in your email, and here is the wiki: http://www.sanctuaryshard.com/wiki/index.php?title=Main_Page