JavaScript code to handle comment folding (similar to Reddit's)?

Question

I really like the way Reddit's comment system works - particulary the ability to smoothly fold/unfold a tree of comments.

Is there some standard JavaScript code/library that does this? Or did Reddit develop this inhouse and is not portable?

I'm fairly a beginner in JS, so browsing through Reddit's page source is not that helpful.

Answer 1

You can do it in a dozen lines of pure JavaScript, but jQuery has convenient slideUp() and slideDown function that do that in a line or two.