Menu customization in WSS

I activated flyout menus on a WSS site today, and everything works fine - except ONE thing.. Why is it always like that with Sharepoint that when you win some - you loose some?? I have branded the menu and before I activated flyouts, the selected menu (that is, the ACTIVE menu) was showing the right background image (a darker image). But after - and this is interesting - the selected menu does not display the "over" image but instead it is the "Home" menu that looks like the selected one. I wrote my own class in my css file to make it override but that did not effect the style so I probably have to explore the sp asp menu object a bit more...