function addfavorite(oid){
	post_data = "oid="+oid;
	new Ajax.Request("/_resource/addfavorite.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: post_data,
			onSuccess: function(httpObj){
				alert(httpObj.responseText);
			},
			onFailure: function(httpObj){
				alert("追加できませんでした。");
			}
		});
	return false;
}