* left: 50, opacity: 'show'
* }, 500);
*
+ * @test stop();
+ * var hash = {opacity: 'show'};
+ * var hashCopy = $.extend({}, hash);
+ * $('#foo').animate(hash, 'fast', function() {
+ * ok( hash.opacity == hashCopy.opacity, 'Check if animate changed the hash parameter' );
+ * start();
+ * });
+ *
* @name animate
* @type jQuery
* @param Hash params A set of style attributes that you wish to animate, and to what end.