Something

var custom = {'init' : custom_init};

function custom_init()
{
	custom.countries = {'defaults' : {}};

	custom.countries.callback = function(data)
	{
		eval(data);
		process_dropdown_callback(results, defaults, 'state');
	}

	custom.countries.populate = function(q)
	{
		QueryAjax(null, 'index.php', {'_a' : 'request', '_b' : 'view_states_by__country', 'query' : (q ? q : '')}, null, null, 'custom.countries.callback(data);');
	}

	custom.states = {'defaults' : {}};

	custom.states.callback = function(data)
	{
		alert(data);

		eval(data);
		process_dropdown_callback(results, defaults, 'city');
	}

	custom.states.populate = function(q)
	{
		QueryAjax(null, 'index.php', {'_a' : 'request', '_b' : 'view_cities_by__state', 'query' : (q ? q : '')}, null, null, 'custom.states.callback(data);');
	}
}