a:hover background flash

[liunx]

Site:
<!-- m --><a class="postlink" href="http://138.67.44.139/RMAG/about/">http://138.67.44.139/RMAG/about/</a><!-- m -->
CSS:
<!-- m --><a class="postlink" href="http://138.67.44.139/RMAG/layout.css">http://138.67.44.139/RMAG/layout.css</a><!-- m -->

Problem:
The background flashes to the page background when going over the menu. How can I avoid that?

Thanksuhhh...its working or me....and i got the damn outdated ie 4.0, loltry taking the change of font size out on the a:hover