//------------------------------
//オンロードイベント
//------------------------------
$(function(){
    var image_number = Math.floor(Math.random() * 3);
    var image_nm_prefix = "../imgs/";
    var image_path = "";

    switch (image_number) {
        case 0:
            image_path = image_nm_prefix + "in.jpg";
            break;
        case 1:
            image_path = image_nm_prefix + "in2.jpg";
            break;
        case 2:
            image_path = image_nm_prefix + "in3.jpg";
            break;
    }
    $("#bar_header").hide();
    $("#bar_header").attr("src", image_path);
    $("#bar_header").fadeIn();
});