Wordsmith-Anvil / WP e-commerce navigation

When I activate WP e-commerce on my clients site I lose the cool rollovers on the nav. I tried resetting the permalinks, and have search forums both here and getshopping, but can’t seem to find any answers to this. Don’t want to lose the roll over effect.

Any and all help greatly appreciated. I’m on a time crunch – as always.

thanks!