Showing alternate image if Flash is not installed or disabled.

I'm using the attached code to display my flash files.

I'm loading up a movie depending on the page parameter in the URL, and while everything works fine in IE, it is not working in FF.

With the embed tag in place to get the movie to show in FF, the image appears below the flash file. In IE, it works with or without the embed tag. If Flash is on, the correct file is shown, if Flash is disabled the regular image shows.

What can I do to fix behavior in FireFox?

<div class="productGroupTop">
         <asp:HyperLink id="lnkGroupHero" runat="server">        
            <object classid="clsid:d27cdb6e-ae6d-11cf-96b8-444553540000" codebase="http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=8,0,0,0" width="800" height="233" id="GroupPageMovie" align="middle">
            <param name="allowScriptAccess" value="sameDomain" />
            <param name="allowFullScreen" value="false" />
            <param name="movie" value="<%= Page.ResolveUrl("~") %>/<%=FilePath.tostring() %>" />
            <param name="quality" value="high" />
            <param name="bgcolor" value="#ffffff" />
            <param name="wmode" value="transparent" />
            <param name="salign" value="tl" />
            <embed src="<%= Page.ResolveUrl("~") %>/<%=FilePath.tostring() %>" quality="high" bgcolor="#ffffff" width="800" height="233" name="GroupPageMovie" align="middle" allowScriptAccess="sameDomain" allowFullScreen="false" type="application/x-shockwave-flash" pluginspage="http://www.macromedia.com/go/getflashplayer" />
             <div id="heroImage">
            <asp:Image ID="imgGroupHero" runat="server" />
            </div>
         </object>
        </asp:HyperLink>

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