Hover background color for thread listings?

[Warlord]

I'm trying to make it so that when you hover over a topic the table row changes color. I've tried several variations for selectors and I am coming up short. Any ideas?

EDIT: I really thought threadlisthead.color:hover would've been right but it doesn't seem to be. This is what I'm using.

.threadlisthead.color:hover {
background-color: #E9E9E9;}