You need to make the transparent Silverlight control basic HTML. I do it the way I saw it before, but something is not jiv ...
<object data="data:application/x-silverlight-2," type="application/x-silverlight-2"
width="640px" height="296px">
<param name="source" value="ClientBin/slvStartPage.xap" />
<param name="onError" value="onSilverlightError" />
<param name="pluginbackground" value="Transparent" />
<param name="iswindowless" value="true" />
<param name="minRuntimeVersion" value="3.0.40624.0" />
<param name="autoUpgrade" value="true" />
<a href="http://go.microsoft.com/fwlink/?LinkID=149156&v=3.0.40624.0" style="text-decoration: none">
<img src="http://go.microsoft.com/fwlink/?LinkId=108181" alt="Get Microsoft Silverlight"
style="border-style: none" />
</a>
</object>
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