HTML: Bug when using dropshadows with mouseovers

[steve.ledger]

Drop shadows applied to a popup button set causes partial drawing of the adjacent mouseover object to the bounds of the shadow when the current mouseover object is active.

Applying the same drop shadow to both button sets does not resolve the problem.

Applying the drop shadow to ONLY the mouseover set causes the shadow to become clipped by the popup button bounds.

Test Page Here