Silverlight appears on top of pop-up menu

The SharePoint site I'm working on features a top navigation bar that drops down a submenu when the main menu buttons are hovered over.  There's nothing particularly clever going on there - it uses jQuery, and is tied in with the standard SharePoint navigation.

However, a few pages on the site have a Silverlight object at the top of the editable page - so, directly underneath the top navigation bar.  On these pages, the Silverlight object would appear to be always on top, so the pop-up element would always appear behind it.  This means that you couldn't navigate to other areas of the site.

I found a fix on the Silverlight forums that consisted of two parts:

1. For the DIV that contains the Silverlight object, position: absolute is required.
2. For the Silverlight object, an additional param is required: windowless should be set to true, like this:  <param name="Windowless" value="true"/>

Problem solved, like magic.