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Finding and traversing DOM elements in JavaScript

Do you have to furnish a lot of HTML elements from JavaScript, such as for formatting or inserting special effects? Well, then you need to know the performance - or lack thereof - of finding and traversing DOM elements. And the performance hit of using Microsoft's browser.
This post tries to clarify the performance hits involved. [...]

Prototype arrays - improving upon Ajax?

There is this popular wrapper for common JavaScript idioms, called Prototype. I will not explain it - since that is done elsewhere - nor praise it. What I will do is to look critically at one part of this library, the array extensions.
This library is used by most fancy AJAX libraries popping up, whether they [...]