add a +/- button to collapse categories/subcategories?

[BMcPuffin]

I have a question about my categories list above...

I want to add a +/- style box next to each category and subcategory and sub-sub-category and so-on so I can maximize/minimize them instead of the incredibly ugly and useless "|_".

Currently, if you click on a category to display the subcategories, you can't click on the same category and have the category minimize so you can neatly browse the other categories above/below... instead, you have to scroll all the way down (in the case of my website its not so bad, but still bad enough to warrant a complaint) to click on the next category and the category you were just browsing will minimize and display the next category. Its cumbersome and very primitive feeling. I mean it really feels like a 1995 solution to a 2012 problem.

Also, the "|_" that is prefixed before all sub-categories is VERY ugly and VERY irritating to my eyes. It is a blatant and obvious turn off to the aesthetic of my website. I would like to change this out for a small .jpg bullet.

Also, there is a stupid -> placed after every category that has subcategories in it, and I'd like to just get rid of these arrows altogether. Is this possible?

PLEASE HELP!

You can see my website at http://www.wellroundedwoodturning.com