DHTML/AJAX style navigation

I need a way to navigate a hierarchical database without reloading the page. Please follow the examples demonstrated in the following HTML: <[login to view URL]> The person first clicks a category from the sidebar (Category A for example) and sees [login to view URL] . THis is accomplished with a traditional link that generates the page. From now on, unless a different category is selected, the navigation occurs entirely via AJAX style javascript modification of the DOM, getting data from specific client side ASP VB scripts. Upon choosing a sub category in the list box, 2 things change: a) The main content are is updated with the results of a database query. For now you can just fake it by constructing a breadcrumb string as despicted and I will construct the query myself based on values sent from the list box. b) Another list box is added with another section of navigation choices constructed server side from a database query. The result is [login to view URL] Navigation can proceed down the hierarchy as depicted in [login to view URL] and [login to view URL] If at any point a user clicks an earlier part of the navigation, for example a different selection in the first list box, the chain begins again, as in [login to view URL] The coder can create fake stub scripts to simulate database queries as I cannot send the original database itself. To demonstrate updated content it is enough to dynaicallly write the contents of the main area: div#main_content Remember that this must occurr without a page reload, entirely by javascript modification of the page in browser, and must work in IE 5.5, 6 and Firefox 1.5 Whether the HTML during these updates is genereated server side and passed down as a big string via an asynchronous request, or it is passed as an array and the JavaScript constructs the HTML is left to the coder. ## Deliverables 1) Complete and fully-functional working program(s) in executable form as well as complete source code of all work done. 2) Deliverables must be in ready-to-run condition, as follows (depending on the nature of the deliverables): a) For web sites or other server-side deliverables intended to only ever exist in one place in the Buyer's environment--Deliverables must be installed by the Seller in ready-to-run condition in the Buyer's environment. b) For all others including desktop software or software the buyer intends to distribute: A software installation package that will install the software in ready-to-run condition on the platform(s) specified in this bid request. 3) All deliverables will be considered "work made for hire" under U.S. Copyright law. Buyer will receive exclusive and complete copyrights to all work purchased. (No GPL, GNU, 3rd party components, etc. unless all copyright ramifications are explained AND AGREED TO by the buyer on the site per the coder's Seller Legal Agreement). ## Platform ASP VBScript on server side, Javascript on client side.