getInstaceOf from the same class, so we can retrieve the var name thas contains the object

gistfile1.txt

  /**
	 * Get instance names of an object
	 * 
	 * Returns instances
	 */
	function getInstancesOf() 
	{		
		var instances = [];

		for(var v in window) {
			if(window.hasOwnProperty(v) && window[v] instanceof PlayerInterface) {
				instances.push(v);
			}
		}

		return instances;
	}

It comes from:
http://acidmartin.wordpress.com/2012/03/19/getting-instance-names-of-a-javascript-object/