knockout.extenders.url.js

ko.extenders.url = function (target, option) {
  var value = $.address.parameter(option);
	if (value) {
		target(value);
	}

	target.subscribe(function (value) {
		$.address.parameter(option, value);
	});

	$.address.change(function (event) {
		target(event.parameters[option]);
	});

	return target;
};