Trying to write a very simple extension, that requires a toolbar button. Been trying to get this sample working, but I cannot seem to get it to work on MediaWiki 1.8.2

WikiBooks Add Button Sample Code - http://en.wikibooks.org/wiki/Help:MediaWiki_Developer%27s_Handbook/Add_Butto...

Has 1.8 changed the way this works?

What do I need todo to get this to work now?

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