Layout breaks in FireFox

I’m having a problem with a page layout going to pieces in FireFox. I am embedding a poster frame/QuickTime in a page which seems to completely screw up the layout, but only in FireFox and not in Safari. You can view the problem in action here: https://www.innitdigital.com/wordpress
Select “Restricted Access” from the sidebar and use “access2005” as the password. You’ll see (in FireFox) that the layout has gone all over the show.
The code I’m using is as follows:

<object classid=”clsid:02BF25D5-8C17-4B23-BC80-D3488ABDDC6B” codebase=”https://www.apple.com/qtactivex/qtplugin.cab&#8221; height=”196″ width=”240″>
<param name=”src” value=”poster.mov”>
<param name=”href” value=”actual_movie.mov”>
<param name=”target” value=”myself”>
<param name=”autoplay” value=”false”>
<param name=”controller” value=”false”>
<embed height=”196″ pluginspage=”https://www.apple.com/quicktime/download/&#8221; src=”poster.mov” href=”actual_movie.mov” target=”myself” type=”video/quicktime” width=”240″ controller=”false” autoplay=”false”>
</object>

Any pointers would be very much appreciated.

Thanks in advance,

Ole