function ran01() {
        var r;
        xx = new Array();

xx[0] = '';

        r = Math.floor(Math.random() * xx.length);
        document.write(xx[r]);
}



function ran02() {
        var r;
        xx = new Array();

xx[0] = '<img src="./bike_img/shujyu3.jpg">';


        r = Math.floor(Math.random() * xx.length);
        document.write(xx[r]);
}