The usage is very simple. Simply put all your images inside of a container either table, div, span, whatever, and give it either an ID or Class of rollernav. You can modify the jQuery.jRoller.js file at the bottom to add/remove items. Then it will simply go through all the image tags there and reformat them to 1/2 the height of the image, thus cutting off the hover part, and setting it to the background of a Div that will move the background on hover. It does all this on load so it doesn’t have to reformat the page after it’s loaded and make your site look crazy for a second or so on slower machines.
I have provided 3 links here, a download with example, a download of just the js file in zip format, and a hot link to the file so you can add it to your blog or site without having to download it.
Download only the JS file Here