/**
 * コンボボックスに表示する各要素を取得するためのStore
 * @param {Object} classId
 */
function getDsForMaker(classId) {
	var MakerRecord = Ext.data.Record.create([
		{name: 'makerId'},
		{name: 'makerName'},
		{name: 'url'}
	]);
	var reader = new Ext.data.JsonReader(
		{
			root: "maker"
		},
		MakerRecord
	);
	var proxy = new Ext.data.ScriptTagProxy({
		url:'http://www.parts-station.com/phps/forms/makers.php',
		method:'GET',
		callbackParam:'callback'
	});
	var dataStore = new Ext.data.Store({
		reader: reader,
		proxy:  proxy,
		baseParams: {
			classid: classId
		}
	});
	return dataStore;
}