Hi there, I'm such a newbee that I can't even verbalize the function I'm looking to create ... therefore, my attempts to ferret out the answer via searching the forum have come to naught.

My blog sidebar has a tremendous number of categories and subcategories that just scrolls on forever, and I don't want them all listed initially -- I'd like to hide the subcategories and let users click a little + or - to open and close those categories.

Right now my blog looks like this

Category 1
subcategory a
subcategory b
Category 2
subcategory c
subcategory d
Category 3
subcategory e
subcategory f
...

I'd like it to look like this:

+ Category 1
+ Category 2
+ Category 3
...

Then if a user chooses to click on Category 1, it looks like this:

- Category 1
subcategory a
subcategory b
+ Category 2
+ Category 3
...

And so on.

This function can be seen in all its glory in the right-hand side box labeled "Skin repository: v0.9.0.11" at:

http://skins.b2evolution.net/

I'd appreciate any and every piece of advice... and just so it's known, I'm more of a cut-and-paste type of guy as I've never written a piece of php code in my life but I'm looking to learn!