var select_data = {};
select_data.office = [
[0, 0, " "],
[0, 1, "New York"],
[0, 2, "London"]
];

select_data.department = [
[0, 0, " "],
[1, 1, "Executive"],
[1, 2, "Administration"],
[1, 3, "Original Design"],
[1, 4, "Technology"],
[2, 5, "Original Design"],
];

data = $H(select_data);
data.keys().each(function (cKey) {
	alert(data.get(cKey));
});