Standards, most comprehensive tutorials and compatibility lists.

Related links:

• gecko DOM reference @ Mozilla developer center
• Event compatibility tables @ QuirksMode

IE does not support hasAttribute method

It just doesn't... it turns out that hasAttribute is a DOM Level 2 method, which IE is blissfully unaware of. The solution is to check the getAttribute for null value.

Related links:

• Attribute nightmare in IE - by Tobie Langel
• Here's a simulator solution

Toggling the visibility of an element

This can be done by changing either the display or the visibility property of an element.

Related links:

• Seven ways to toggle an element with JavaScript - Dustin Diaz from Google discusses various techniques

Faking Scrollbars with JavaScript

I am not sure if I would ever need to use this technique, but these examples look really nice, and they are cross-browser.

Related links:

• jScrollPane examples