A certainly cool effect is:

I've been left with two options:
1. Integrate the JS code for lightbox 2.
2. Write my own.
Which one is better? Does relying on integrating other JS codes a problem?

If the 2nd one, this is what I have come up with.
I use a window with no header, frame, white background, and upon viewing, I slide it out (using a modified SlideIn effect) with an Image inside.
The problem is that, it is slow and choppy in IE7 (and my computer is fast).
So what should I do?
Is there a better way of making it happen in EXT GWT?

Otherwise, I might just use Lightbox 2.