Extend - JavaScript function to extend Objects

extend.js

var extend = function (obj, extObj) {
	if (arguments.length > 2) {
		for (var a = 1; a < arguments.length; a++) {
			this.extend(obj, arguments[a]);
		}
	} else {
		for (var i in extObj) {
			obj[i] = extObj[i];
		}
	}
	return obj;
}