function citySelectChg(element, value) {

	if ( value != "" ){
		new Ajax.Request("index.php", {
			method: "POST",
			requestHeaders: ["Content-Type", "application/x-www-form-urlencoded charset=UTF-8", "If-Modified-Since", "Mon, 21 Nov 2006 00:00:00 GMT"],
			parameters: "key_id="+value+"&cmd=get_city_dtl",
			asynchronous:false,
			onSuccess: function(httpObj){
				returnText = httpObj.responseText;
				$("city_dtl_span").innerHTML = returnText;
		},
			onFailure: function(httpObj){
				alert("データの取得に失敗しました。");
			}
		});
	}else{
		$("city_dtl_span").innerHTML = "";
	}

}