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).
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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).