[jmathai]

If you haven't committed to a Javascript library then I'd take a look at jQuery. Every library has it's pros and cons but you'll likely find more support for jQuery than any of the others.

I used to use prototype.js and once I used jQuery I never looked back.

Props to prototype.js though as it was one of the first standard libs that did a really good job abstracting away the crappy parts of JS (browser deps).