The HtmlJavascript is a special tiddler that allows you to add javascript files to the html serialization of a space.

The tiddler is a new line separated list of javascript files
e.g. 

http://foo.tiddlyspace.com/tiddlername.js
tiddlername
/bags/glossary_public/tiddlers/tiddlername
bag
glossary_public
created
Thu, 16 Jun 2011 15:36:41 GMT
creator
jon
modified
Thu, 16 Jun 2011 15:36:41 GMT
modifier
jon