Generic JQuery plugin template

jquery.fn.js

(function($) {
  $.fn.plugin = function() {
    return this.each(function() {
      var $this = $( this );
      if ( !$this.data('plugin') ) {
        $this.data( 'plugin', new Plugin(this) );
      }
    });
  }

  Plugin = function() { ... }

})(jQuery);