How do you remove the drop shadow in the image area?

Subject says it all. I've looked all over and can't find a way to disable it.

Edit->Preferences->Interface
Look in the upper part of the window where it says Border and change it to None

Do you mean this?

< http://www.pixentral.com/show.php?picture=1IHK6nmJBPzlerUr42 e58NHBJ3mKv0>

Thanks to the both of you! I swear I looked through there three or four times and didn't see that option even though I changed other options on that screen.