Javascript - browser sniffing - wmode/flash/dhtml menus

Hi, I wonder if anyone can help me put together a browser sniffer:

What I need to do is:
1. sniff for browsers that do not support WMODE (see below)
2. sniff for browsers that do not have flash installed
3. sniff for browsers that have a version of flash less than the minimum required to support WMODE (windows Flash 6,0,65,0) & (mac Flash 6,0,67,0).

For these browsers I need to serve a static image instead of a flash movie.
- The reason being is that a dhtml menu will sit on top of the flash movie - which is made possible with WMODE.

The browsers I defintely need to provide this support for are:

IE5+ (PC and Mac),
firefox, safari, opera

The following browsers support "Windowless Mode" (wmode):

Windows and Mac OS X

Internet Explorer 3 or higher (Windows)
Internet Explorer 5.1* and 5.2* (Macintosh)
Netscape 7.0*
Mozilla 1.0 or higher*
AOL*
CompuServe*

* Macromedia Flash Player version 6,0,65,0 (Windows) o 6,0,67,0 (Macintosh) or more recent versions support WMODE.

This is the code I have so far:

<script language="JavaScript">
<!--
 
var flashMovie = '<object classid="clsid:D27CDB6E-AE6D-11cf-96B8-444553540000"
 
codebase="http://active.macromedia.com/flash2/cabs/swflash.cab#version=2,0,0,0" width="559" height="190">
        <param name="movie" value="homepage.swf">
        <param name="wmode" value="transparent">
 
        <embed src="homepage.swf" width="559" height="190" pluginspage="http://www.macromedia.com/shockwave/download/"
 
wmode="transparent">        
</embed>
      </object>';
 
 
  if (is_gecko)
  {
    document.write(flashMovie);
  }
  else if (is_nav7up)
  {
   document.write(flashMovie);
  }
  else if (is_ie3up)
  {
   document.write(flashMovie);
  }
  else if (is_opera8up)
  {
   document.write(flashMovie);
  }
  }
  else
  {
    document.write('<img src="image.jpg" alt="">');
  }
// -->
</SCRIPT>    

HTML:

Thanks for any help.

 

it appears that i am asking a hard question here
in several forums the same response - nothing!