HTML help?

I'm hoping somebody might be able to help me out with this... in my old template, links weren't underlined, but were of a different color, and they changed to bold (and maybe a diffferent color) when the cursor went over them. (See, for example, Mark Byron's blog.) I've tried to find out how to change link formatting, but I don't have the HTML aptitude to do so.

Anyone know what I need to do?