I would like this feature on my site, how to do?

http://sciencefriday.com/blogs/10/18/2013/show-not-tell-the-rise-of-the-infographic.html?series=20

See on the left side, under topics, how it has a graphic and then when you roll-over it pops out? Is there a wordpress plugin that does this or a block of code a newbie can easily understand?

I'd also be open to hiring someone to do it for me if they can do it quickly and I can reuse it on many sites. Thanks in advance for your help!

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