Dynamic taxonomy navigation / hierarchical drop down list

Dynamic taxonomy navigation / hierarchical drop down list

I'd like to provide my users a way to navigate a taxonomy by successively drill down ono drop down lists.

A simple example would be something like ebay's categories. Say you pick the category "Clothing", the next drop down list would display all the sub-categories under Clothing such as "Shorts", "Pants", "Coats" etc. And this can go on arbitrarily deep.

I looked at Giva's mcDropdown plug-in. The interface looks really nice. However it seems to require the entire taxonomy to be passed to the plug-in in one go. Other plug-ins I looked at also have this limitation.

I need somethinig that retrieves & displays data dynamically. So after the user picks "Clothing", the UI sends that selection back to the server, which then sends back a list of sub-categories of "Clothing", so on and so forth.

Is there any plug-in that does that? Or what would it take to implement that in jQuery?

Thanks.