All this information is available within the flash object in overall_header.tpl
Code:
<object classid="clsid:d27cdb6e-ae6d-11cf-96b8-444553540000" codebase="http://fpdownload.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=7,0,0,0" width="160" height="108" id="logo" align="middle">
<param name="allowScriptAccess" value="sameDomain" />
<param name="movie" value="templates/Clanzi2K/images/logo.swf">
<param name="quality" value="high" />
<param name="bgcolor" value="#000000" />
<embed src="templates/Clanzi2K/images/logo.swf" quality="high" bgcolor="#000000" width="160" height="108" name="logo" align="middle" allowScriptAccess="sameDomain" type="application/x-shockwave-flash" pluginspage="http://www.macromedia.com/go/getflashplayer" />
</object>
The size is 160x108 and the background color is black #000000
You can easily remove the current flash from the template and just replace the above code with the new code that Macromedia flash generates for you