how to change code of the “collapsible archive widget” for categories

I’d love to have this, too.

Link to the widget might help.

Also might look at:
https://www.cimatti.it/blog/cimy-wordpress-plugins/cimy-navigator/
https://voidsplat.org/code/wordpress/fancy-categories/

As I said in another thread, those plugins don’t work with WP 2.3, at least not entirely. Here is the link to the collapsible archives widget. Hopefully, someone can adapt it to work with the categories list of WP 2.3.

It’s not a plugin, but I found a solution here.

don’t trust all that you read.
Cimy Navigator 0.4.x works perfectly with WP 2.3, if someone isn’t able to make it works it’s another story.

Well then, I have “another story”. I followed the directions to the tee and couldn’t get Cimy Navigator to work with WP 2.3, just like the many comments I read on the plugin’s webpage. Perhaps the documentation isn’t clear enough for the general populace.

A lot of people cannot understand how to use it, but please avoid to say false things.
Documentation is clear, example works (you only have to change a parameter as written many times), so it’s difficult to understand how to explain better.

I’ve configured it in a tons of sites with WordPress 2.1, 2.2 and 2.3 and always worked, so probably it’s not a problem of the plug-in

best regards

Better yet, WP-dTree was finally modified to work with WP 2.3!