function chPanel(panelName) {

	//バイク検索パネル表示
	if (panelName == "bike") {

		document.getElementById('car_panel').style.display = "none";
		document.getElementById('bike_panel').style.display = "block";

		document.getElementById('car_ranking').style.display = "none";
		document.getElementById('bike_ranking').style.display = "block";
                
		document.getElementById('car_maker').style.display = "none";
		document.getElementById('bike_maker').style.display = "block";

	//クルマ検索パネル表示
	}else{

		document.getElementById('car_panel').style.display = "block";
		document.getElementById('bike_panel').style.display = "none";

		document.getElementById('car_ranking').style.display = "block";
		document.getElementById('bike_ranking').style.display = "none";
                
		document.getElementById('car_maker').style.display = "block";
		document.getElementById('bike_maker').style.display = "none";


	}
	
	//デフォルト表示指定用パラメータをクッキーに保存
	document.cookie = "panel="+escape(panelName);

}