+ * Extends the jQuery object itself. Can be used to add both static
+ * functions and plugin methods.
+ *
+ * @example $.fn.extend({
+ * check: function() {
+ * this.each(function() { this.checked = true; });
+ * ),
+ * uncheck: function() {
+ * this.each(function() { this.checked = false; });
+ * }
+ * });
+ * $("input[@type=checkbox]").check();
+ * $("input[@type=radio]").uncheck();
+ * @desc Adds two plugin methods.