How do I: Replace buttons?
 

I'm trying to replace my buttons to match the new colors on the template. The original buttons can be seen here: uncollapsed link on my website: forum.austinurbanforum.com. I want to replace them with the generic ones in the software found here and here

How do I do this?

The Image path is usually
/images/buttons/..

Just follow that forum structure and add ur icons there with same name as of collapsed and uncollapsed.
collapse_tcat.gif
collapse_tcat_collapsed.gif

What about my second skin? Then it will be effected too. I'm just trying to change them on one skin.

Well then u have to edit style vars of the style u wana change to.
Make a new folder inside ur skin which is copy of the buttons folder, name it prolly buttons_alt. and add the diff. images
then change the Style Path to just that specific button folder.