Object.clone()

clone.js

Object.clone = function(obj) {
	var type = typeof(obj);

	if (obj instanceof Date) {
		return new Date(obj.getTime());
	}
	else if (obj instanceof Array) {
		return obj.slice(0);
	}
	else if (type == "string") {
		return "" + obj;
	}
	else if (type == "number") {
		return 0 + obj;
	}
	else if (type == "object") {
		var clone = new obj.constructor;
		for (var key in obj) {
			if (obj.hasOwnProperty(key)) {
				clone[key] = Object.clone(obj[key]);
			}
		}
		return clone;
	}
	else {
		return obj;
	}
}