Adding swf file to replace galleryLogo_sm.gif

Trying to add my swf file (its small) to the gallery where the galleryLogo_sm.gif is. The code I am using is:

<OBJECT CLASSID="clsid:D27CDB6E-AE6D-11cf-96B8-444553540000" CODEBASE="http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=5,0,0,0" HEIGHT=123 WIDTH=388 ID="Flash1">
<PARAM NAME="Movie" VALUE="http://www.hotshotsdigitalimaging.com/assets/applets/logo.swf">
<PARAM NAME="Quality" VALUE="AutoLow">
<PARAM NAME="Loop" VALUE="0">
<PARAM NAME="Play" VALUE="1">
<PARAM NAME="Scale" VALUE="ShowAll">
<PARAM NAME="SAlign" VALUE="L">
<EMBED ID="Flash1" SRC="http://www.hotshotsdigitalimaging.com/assets/applets/logo.swf" HEIGHT=123 WIDTH=388 PALETTE=BACKGROUND Quality=AutoLow Loop=FALSE Play=TRUE Scale=ShowAll SAlign=L ALT="" PLUGINSPAGE="http://www.macromedia.com/go/getflashplayer/">
</OBJECT>

I am using the matrix theme with the black colorpak. Not even sure which file to edit (theme.tpl or main.php)?

Any help please.

Ken