This site has a tool called Snap Shots that enhances links with visual previews.

Sometimes Snap Shots bring you the information you need, without your having to leave the site, while other times it lets you “look ahead,” before deciding if you want to follow a link or not.

Should you decide this is not for you, just click the Options icon in the upper right corner of the Snap Shot and disable.  This will prevent the window from appearing while on my site.