FLV funky in FF - works but doesn't

I have used the FLV component in Flash and am having some problems with it working in FF.

It does not play when the direct URL is:
http://www.somesite.com

However, it does work when the direct URL is:
http://somesite.com

Does anyone know why this is?

Here is my code for the FLV/SWF:


<script type="text/javascript">
AC_FL_RunContent( 'codebase','http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=7,0,19,0','width','600','height','442','title','FlashRes Demo','src','FlashRes_Demo','quality','high','pluginspage','http://www.macromedia.com/go/getflashplayer','movie','FlashRes_Demo' ); //end AC code
</script>

  <noscript>
  <object classid="clsid:D27CDB6E-AE6D-11cf-96B8-444553540000" codebase="http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=7,0,19,0" width="600" height="442" title="FlashRes Demo">
    <param name="movie" value="FlashRes_Demo.swf" />
    <param name="quality" value="high" />
    <embed src="FlashRes_Demo.swf" quality="high" pluginspage="http://www.macromedia.com/go/getflashplayer" type="application/x-shockwave-flash" width="600" height="442"></embed>
  </object>
  </noscript>


THANKS!!