function chg_btn(cityCode, num) {
	for (var i = 1; i < 9; i++) {
		if (i == num) {
			document.getElementById("ticketContent" + i).style.display = "";
			document.getElementById("button"+i).className="shang1";
		} else {
			document.getElementById("ticketContent" + i).style.display = "none";
 		    document.getElementById("button"+i).className="shang2";			
		}
	}
}