function stroke(_pet_id) {
    $("#petImage a img").effect("bounce", { distance: "12", times: "2" },500);
    $.getJSON(
        "http://api.pcpp.jp/stroke/?callback=?",
        { 
            "pet_id": _pet_id, 
            "format": "json"
        },
        function (data) {
            var json = data;
            if ( json.status == "success" ) {
              var result = json.data;
              if (result["stroke_photo_url"]) $("#petImage a").attr("href", result["stroke_photo_url"]);
              if (result["stroke_photo_src"]) $("#petImage a img").attr("src", result["stroke_photo_src"]);
              $("#statusMessage").empty().append('<p class="text" style="display: none;">'+ result["appreciation_msg"] +'</p><p class="day"></p>');
              $(".nadenade span").text(result["stroke_count"]);
              $("#statusMessage").css("display", "block");
              $("#statusMessage p").show("slow");
            }
        }
    );
}