I think when you are logged into your ebay account it has an option for showing the embed code but just in case it doesn't, here is the code for this auction.
<object height="300" width="355"><param name="movie" value="http://togo.ebay.com/togo/togo.swf"><param name="flashvars" value="base=http://togo.ebay.com/togo/&lang=en&mode=normal&itemid=150463942654&query=Puppets">
<embed src="http://togo.ebay.com/togo/togo.swf" type="application/x-shockwave-flash" flashvars="base=http://togo.ebay.com/togo/&lang=en&mode=normal&itemid=150463942654&query=Puppets" height="300" width="355">
</object>
The code actually stays the same all the time except for the part that comes after
itemid=. This appears twice in the code. So actually once you know this base code you can alter it manually. That is what the site here does. It takes the base code and inserts the itemid you supply in the correct place. Depending on what you are using to build your site, you can there may be a plugin or that would automate the process like here.