Validated page media won't plkay in Mozilla and Netscape

Hi;
I have been having some problems with flash and different browsers. 1. I m
using one of the work around codes for embedding swf files. This is the code:


<object classid="clsid27CDB6E-AE6D-11cf-96B8-444553540000"

codebase="http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#ve
rsion=8,0,22,0"
width="240" height="180">
<param name="movie" value="258/show.swf" />
<param name="quality" value="high" />
<param name="bgcolor" value="#FFFFFF" />
<!--[if !IE]> <-->
<object data="flash.swf" width="240" height="180"
type="application/x-shockwave-flash">
<param name="quality" value="high" />
<param name="bgcolor" value="#FFFFFF" />
<param name="pluginurl"
value="http://www.macromedia.com/go/getflashplayer" />
</object>
<!--> <![endif]-->
</object>

which play fine in IE. I have 4 pages that have swf files loaded. This same
code with height and width changed to match the files works on only 2 of the
pages in Mozilla and Netscape but all 4 work in IE. Curiously, the pages
validate in the W3C Markup Validation Service. I have even tried the UFO which
yields the same results.

2. There seems to be a number of workaround for swf embed but are there any
for flv files?

3. I have a page with the first line:

<%@LANGUAGE="JAVASCRIPT" CODEPAGE="1252"%>
Which doesn?t validate. It says %> is not allowed.

Any help will be greatly appreciated. Thanks