Forum:Rollover Buttons using html

I have three separate questions but all involve the use of html in wikia articles:
 * 1) Is there a way to use html in a wikia article to display and make functional a rollover image such as a "click-me" button?
 * 2) Is there a way to use html to cause a pop-up window to appear when hovering over a text link or image?
 * 3) If it involves the use of a CSS stylesheet, (and our's is currently empty) would adding any sort of java-script code or html code mess up the rest of the site's display features?

I have searched both on the wikia help pages, the forum, and via google search and can not seem to find any clear answers. So your help would be most graciously appreciated.


 * All of those can be done, but require more information. Can you give an example of what you're trying to do?