Windows Explorer-like interface

Hello,
This may be too general a question for this forum, my apologies in advance if it is....I'm trying to build a PHP script that will act as a media playlist builder. I have built an two-level array. The top level has keys of album names and each value is an array that is keyed by track number. The value associated with the track number is the url of the song...

What I'm looking for is a code example of something that looks kinda like windows explorer.. I want the album names listed with a little '+' symbol that when the user clicks on it, it will expand all the tracks in the album..

Any help would be appreciated. Thanks.

you will need to use javascript, so go to the site www.24fun.com and look under 'navigation' there are a lot of JS menuing systems that you might be able to modify to do what you want.

look at this PEAR::HTML_TreeMenu package

http://pear.php.net/package/HTML_TreeMenu

you can buld a tree info from php and just call display. it remembers what nodes where open last time you where on that page. relly slick.

(but if you need to have more than 200 or 300 nodes on one page, it might get a little slow)