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Global variables are evil. Within YUI, we use only two globals: YAHOO and YAHOO_config. Everthing in YUI makes use of members within the YAHOO object hierarchy or variables that are scoped to such a member. We advise that you exercise similar discipline in your own applications, too. Douglas Crockford has been teaching a useful singleton pattern for achieving this discipline, and I thought his pattern might be of interest to those of you building on top of YUI. Douglas calls this the “module pattern.” Here’s how it works: