Then use Flash.
You can download the video too, but as they say, ignorance is the best protection.
Here is a sample to embed what you want. Then proceed to the other pages for details.
http://web.mac.com/wyodor/Embed_Media/
but I have no idea what I'm talking about at this point, haha
Then stick to what you do know about.
Anyway, you want a one size fits all window? A bit of [searching would have found it|http://discussions.apple.com/message.jspa?messageID=6948983#6948983].
http://web.mac.com/wyodor/hello_world/
http://web.mac.com/wyodor/boxsamples/
Drag the lower righthand corner of your browser window.
It cannot be done with iWeb.