Call a constructor with an array of arguments (apply for constructors)

construct.js

function construct(constructor, args) {
	function F() {
		return constructor.apply(this, args);
	}
	F.prototype = constructor.prototype;
	return new F();
}

function firefox_construct(constructor, args) {
	var o = {};
	o.__proto__ = constructor.prototype;
	var res = constructor.apply(o, args);
	if (typeof res !== "undefined") {
		return res;
	}
	return o;
}