function onChange(control, oldValue, newValue, isLoading) {
	if (isLoading || newValue == '') {
		return;
	}

	var user = new GlideRecord("sys_user");
	user.addQuery("sys_id", newValue);
	user.setLimit(1);

	user.query(function(record) {
		if(record.next()) {
			var managerSysid = record.manager;
			g_form.setValue("u_manager", managerSysid);
		}
	});
}