Destroy and recreate !BackgroundIframe javascript object... it doesn't actually destroy the <iframe>, since that goes on a re-use stack, and it has the advantage of cleaning up the CSS expressions on the <iframe> to prevent IE6 performance problems.
Destroy and recreate !BackgroundIframe javascript object... it doesn't actually destroy the <iframe>, since that goes on a re-use stack, and it has the advantage of cleaning up the CSS expressions on the <iframe> to prevent IE6 performance problems.

Fixes #9208 !strict.

git-svn-id: 674a2d6b1e32e53f607eb824547723f32280967e@19119 560b804f-0ae3-0310-86f3-f6aa0a117693

harbalk/delite,harbalk/delite,kitsonk/delite,kitsonk/delite,Sam-Cummins/delite,Sam-Cummins/delite