Actually, here's what I did (I'm real impatient). I'm using another lightbox plugin (it's a WordPress site), so I used the Add to Cart and View Cart buttons without the javascript. Then I just added the parameters on the buttons that call the lightbox plugin, and it opens up the e-junkie cart in an iframe within the lightbox. As long as the href parameters are all there, it should work right? The cart seemed to function normally this way.