Appearance of Links

I would like to change the appearance of the links that I have appearing on my sidebar. I have many links. I want to keep them accessible, but tidy them up. I was thinking of some sort of way to have them hidden under their heading until the heading is clicked or the mouse goes over the heading.

Is there a plug in or some other way to accomplish this?

I sincerely appreciate any help or guidance that can be provided.

I am using the WP-Andreas09 theme.
My website is DurhamPolitics.com