http://www.smarty.net/docs/en/api.register.resource.tpl:
With 5 elements the first element has to be an object reference or a class name of the object or class implementing the resource and the 4 fol ...
Let me second this request. Please make sure there is a Bookmarks in .pdf Documentation so that it was easier for us to navigate. It's a pain to use your PDF documentation at the moment.