Disqus popup div vs. Silverlight control Z-Order

Playing with Disqus for commenting, but the problem is that we have a Silverlight control for playing video right above the Disqus comments.

Example page: http://play.nimbushd.com/view/lfm7

When an anonymous/not logged in user presses the "Post as..." button to post a comment, the Disqus guest/login div dialog pops up, but is behind the Silverlight control, preventing the user from proceeding any further.

How can I either fix the z-order, or override the开发者_运维技巧 Disqus CSS to position the comment popup below the Silverlight control?

Edit: Screenshot of issue:

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Found this Channel 9 post that addressed the issue:

Overlaying HTML over Silverlight

On the <object> tag, add style="z-index: -1;" and set param Windowless to true in the Silverlight embed params.