I have been using Mark Kruse's Javascript toolbox site for a while to download those Javascript functions that you just need NOW! I spotted that he has finally moved his scripts to its own site! Javascript Toolbox is a great site full of easy to implement functions such as a DHTML tree, all the select box functions you would need (sorting, moving, multiple selects etc). He also has started http://www.ajaxtoolbox.com/ with some great libraries! Just what the JS doctor ordered!