Flooble Hierarchical Select Menu
Traditional HTML Select Menus aren't very good for presenting Hierarchical data, and this script was made to address that need. It allows you to build a Select-like Menu, which can contain any number of Sub-Menus, of infinite depth, so you can let your visitor drill down to the item they want instead of scrolling for it. The new control ties to a Hidden form field, so the selected value is submitted as normal. Works with all major browsers.