Can someone help me figure out how to resolve the issue on hover with the PNG24 used in this nav in IE8 & 9? here's the link: www.dynodealz.com/nav

it seems like there are a bunch of different methods to deal with PNG24s in IE 7 & 8 but from what I can tell most of them don't really apply to background graphics. Just hoping someone out there has already dealt with what I'm dealing with and knows what to do.

Thanks.