I will paste the embed code into the HTML editor, then switch back the the visual editor
Try publishing without switching back to the visual editor to preview your work, and see if your code sticks. Flipping between editors can be a problem sometimes.
If you can use “object” instead of the old embed, it should not be stripped out of the editor.
An example of the code:
<object width="320" height="265" type="application/x-shockwave-flash" data="http://www.youtube.com/v/zuJkRpJ7Fxg?version=3"><param name="movie" value="http://www.youtube.com/v/zuJkRpJ7Fxg?version=3" /><a href="http://get.adobe.com/flashplayer/" target="blank"><img src="http://www.adobe.com/images/shared/download_buttons/get_flash_player.gif" alt="Get flash player to play to this file" width="88" height="31" /></a></object>
Just put your information in width, height, data and value.
[Edit] Just in case, it is here also, http://pastebin.com/7XHgt78R