z-index problem

Hi,

I’ve got a dropdown menu positioned right above a rotating image banner. They all work fine except that when the menu drops down it’s behind the rotating banner. I’ve tried changing the z-index of the dropdown menu but to no avail. I can change the z-index of the banner but I can only put it behind everything including the wrapper which has a semi transparent black fill. Is there any way I can fix this? Why cant i change the z-index of the dropdown menu?

Help here would be greatly appreciated. Here’s the site: http://www.ciarangaffey.com/blog

Thanks a lot.