Board Thread:Support Requests - Getting Technical/@comment-32413852-20151209040640

 For exemple, there's a picture of a sad face. You put your mouse over it, and he gets happy. Basically two images;

1 as standard image, 1 as mouseover image. Perhaps a on-click image aswell if that's a thing.

I feel like this can be done through MediaWiki's, or just from source editing, but i'm not entirely sure. Never seen it, and couldn't find answers. Is that possible? If it is, how to?  