Memory leak

gistfile1.js

// creates a script load listener
function create_script_load_listener(elem, registry_item, flag,onload) {
	/**
	 * If the garbage collector use reference count for the host objects
	 * code below will eventually leak if `onload' or `onreadystatechange' hasn't triggered. 
	 * `onload' and `onreadystatechange' create circular reference trought the internal [[Scope]]
	 * elem -> onload -> [[Scope]] -> Variable Object -> elem
	 */
	
	elem.onload = elem.onreadystatechange = function() {
		if ((elem.readyState && elem.readyState != "complete" && elem.readyState != "loaded") || registry_item[flag]) return;
		elem.onload = elem.onreadystatechange = null;
		onload();
	};
}

/*
 * It's quite easy to fix that problem while after assigning `onload', `onreadystatechange'
 * `elem' does not need to store reference to script object :)
 */

//Save way of creates script load listener
function create_script_load_listener1(elem, registry_item, flag,onload) {
	elem.onload = elem.onreadystatechange = function() {
		if ((this.readyState && this.readyState != "complete" && this.readyState != "loaded") || registry_item[flag]) return;
		onload();
	};
	elem = null;
}