If you have ever tried to place a div or similar HTML element on top of a swf flash object you will know that it always tries to take precedence.

You will need to do the following:

In the code for the flash in the embed area add:

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wmode="transparent"

If you are using SWFObject to insert swf files you can do the following:

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<script type="text/javascript">
  var so = new SWFObject("movie.swf", "mymovie", "400", "100%", "8", "#336699");
  so.addParam("wmode", "transparent");
  so.write("flashcontent");
</script>