function SyncList() { }

SyncList.prototype.sync = function () {
	for (var i = 0; i < arguments.length - 1; i++) {
		document.getElementById(arguments[i]).onchange = (function (o, id1, id2) {
			return function () {
				o._sync(id1,id2);
			};
		})(this, arguments[i], arguments[i + 1]);
	}
	document.getElementById(arguments[0]).onchange();
}

SyncList.prototype._sync = function (firstSelectId, secondSelectId) {
	var firstSelect = document.getElementById(firstSelectId);
	var secondSelect = document.getElementById(secondSelectId);

	secondSelect.length = 0;

	if (firstSelect.length > 0) {
		var optionData = this.data[firstSelect.options[firstSelect.selectedIndex == -1 ? 0 : firstSelect.selectedIndex].value];
		for (var key in optionData || null) {
			secondSelect.options[secondSelect.length] = new Option(optionData[key], key);
		}
	}
	secondSelect.onchange && secondSelect.onchange();
};