Flash object not displaying correctly in ASPX file on FF and Opera

I have a problem showing up a SWF file (Flash) in an ASP MVC file.

I have problems adjusting the height to 100%. If this is showed in Firefox or Opera the result is the picture you see below (everything works fine under Chrome and IE).

The code used is the following:

Welcome body { margin: 0px; overflow: hidden; margin: 0; padding: 0; height: 100%; width: 100%; }

    <div id="slideshow" style="height:100%; width:100%"> 

          <object classid="clsid:D27CDB6E-AE6D-11cf-96B8-444553540000"

                  codebase="http://fpdownload.macromedia.com/get/flashplayer/current/swflash.cab"
                  id="name" width="100%" height="100%">
            <param name="movie" value="../../Assets/PlayAround.swf" />
            <param name="quality" value="high" />               
            <embed name="name" src="../../Assets/PlayAround.swf" 
                quality="high"                    
                width="100%" height="100%" 
                type="application/x-shockwave-flash" 
                pluginspage="http://www.adobe.com/go/getflashplayer">

            </embed>
        </object>

    </div> 
     </body> </html>

For sake of future use: Firefox and/or Opera seem not to like using swfObject (as i did)! Some has to use a height definition even for the div which is surrounding the SWF embed tag: This solved my problem!