Dynamic Drop Downs - JS + PHP

Hi,

We're attempting a view on our website, the following is the static version:

http://www.clantemplates.com/previewpane/

Basically the options on the drop down menus are generated from the database.
And the values of the second drop down menu is conditional on the first one.
When a "template" is chosen, it loads on the bottom frame PLUS gives information on the right side.

We have all the information stored in the database already, and call it using {author} {name} {download.link} .. etc.

We have php coders, but no one to do the JS. Any help is appreciated.

Thanks Much