Nivo Slider Transition is affecting dropdown menu font

Although it's hardly noticeable, it's bother开发者_JS百科ing people. When my dropdown menu goes in front of the nivo slider it looks normal, but then when the Nivo Slider transitions, it affects the font.

It thins the font during the slider transition, which isn't easy to notice if I use a thinner font, but easily noticeable when I use something like Helvetica Neue (which I would like to use.)

Hover over the "For Sellers" and you'll see what I mean. If you don't notice it, zoom in a bit and it will hopefully be more obvious. Also, I haven't done any IE debugging, so please check it out in a web-friendly browser to be safe. Any suggestions?

http://yorktown.cbe.wwu.edu/students/101vandera9/sample/Default2.aspx