With the solution above, you don't need to change the template. Is only necessary to create a HTML widget with blogger, and paste the code:

<div align="center"><script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/swfobject/2.1/swfobject.js"></script><script type="text/javascript"> swfobject.embedSWF("http://cdn.tagul.com/cloud.swf", "myCloud", "190px", "350px", "10.0.0", "http://cdn.tagul.com/expressInstall.swf", {id: "14596@1"}, {allowscriptaccess: "always"}); </script></div><div id="myCloud"><p><img
src="http://www.adobe.com/images/shared/download_buttons/get_flash_player.gif" alt="Get Adobe Flash player" /></img
></p></div>

... changing the id and the size to the appropiate.