How photobucket works?

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So I'm making my own little picture hosting site here, and decided to look @ photobucket as an example.

It's fairly simple until it comes to 'sub albums'.

 

Take this photobucket url for instance:

http://smg.photobucket.com/albums/v425/MyUserName/vacations/Florida/

 

okay so when you login, you are at:

http://smg.photobucket.com/albums/v425/MyUserName/

which is your main album.

 

So i then navigate from my main album to my sub album 'vacations' and the url becomes:

http://smg.photobucket.com/albums/v425/MyUserName/vacations/

 

Now notice how as you navigate through your sub albums, the URL format is just like a regular directory hierarchy.

 

It's as is everytime you create an album, an index file is placed in it.

 

So my question is, any idea of how that's being done?

I thought maybe mod_rewrite but doesn't look like so.

 

[revraz]

Why can't your script make a index.php file when you add a subfolder under your main folder?

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and every subfolder there of?

so if i make 100 subfolders, all inside each other, each would have an index file?

if so, what if later i wanted to change something in the script? those already-created index files wouldn't be changed.

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