How do I fix a CSS anamoly in Internet Explorer?

[Zev S]

I have a site with a top menu and a line underneath it. In firefox it looks fine, but in IE, there is a few pixels of space between the two. I have a template file called template_ie.css which is supposed to fix idiosyncrasies like this, but it doesn't do this one. Is there a quick code fix that will lift up the line underneath, or get rid of the line?Thanks.