Humm, interesting issue you have there. My suggestion: jQuery. jQuery will work in every browser, rounded corners and dropshadows are simple and plus, you wouldn’t have the overhead of extra code + extra images to maintain.
Note: add a background for your div’s so that you’ll get a nice dropshadow. However, I haven’t tried both drop shadows AND rounded corners, so you might have to play with my code a little bit until you get what you want.
I am trying to achieve rounded corners on my sidebarcontainer (that houses my sidebarcontent list & my main image (the Boat)) using jQuery.
Not sure what I have done to my code to not make it work. Any Ideas?