1) Download a kit from http://wwf.ca/earthhour/toolkits/ and then logged onto my PBWiki account and created a new folder called EarthHour.
2) Extracted the ufo.js and earthhour_countdown_canada.swf files and uploaded them to the EarthHour folder.
3) Started a new page. (Or, you could edit an exiting page).
4) Go into Edit mode on the page and choose to "Insert Plugin".
5) Select "PBWiki Magic".
6) Select "HTML/Javascript" and allow Javascript to work.
7) The actual code appears below. You can do a copy paste job to put it into your page.
<OBJECT CLASSID="clsid:D27CDB6E-AE6D-11cf-96B8-444553540000" WIDTH="300" HEIGHT="300" CODEBASE="http://active.macromedia.com/flash5/cabs/swflash.cab#version=5,0,0,0"><PARAM NAME=movie VALUE="/f/earthhour_countdown_canada.swf"><PARAM NAME=play VALUE=true><PARAM NAME=quality VALUE=low><EMBED src="/f/1236772543/earthhour_countdown_canada.swf" WIDTH=300 HEIGHT=300 loop=false quality=low TYPE="application/x-shockwave-flash" PLUGINSPAGE="http://www.macromedia.com/shockwave/download/index.cgi?P1_Prod_Version=ShockwaveFlash"> </EMBED></OBJECT>
8) Save it and you're done.
9) Since you're working with Flash, the movie can be resized to your specifications. You'll see that in the code above, this is 300 x 300.