First off: your markup is wrong, more specifically the nesting:
You close the first span, while the anchor is still open. I believe you want this:
Also, I don’t really see the point of putting each line in a separate UL and then have two LI’s in there. I think you’d be better off with one UL, with 4 LIs that each contain two spans, but anyway, that’s not what this issue is about.
Here’s something that you should be able to use: http://jsfiddle.net/fPj52/27/