function random_btn() {
banner = new Array();
banner[0] = "/shared/bnr/191shinshusagami_nagano125x125.jpg";
banner[1] = "/shared/bnr/201shinshusagami_nakagomi125x125.jpg";
banner[2] = "/shared/bnr/194shinshusagami_inariyamaonsen125x125.jpg";
banner[3] = "/shared/bnr/203shinshusagami_nishikaruizawa125x125.jpg";
banner[4] = "/shared/bnr/197shinshusagami_koshigoe125x125.jpg";

link = new Array();
link[0] = "/hall/detail/SAIJOCD/191";
link[1] = "/hall/detail/SAIJOCD/201";
link[2] = "/hall/detail/SAIJOCD/194";
link[3] = "/hall/detail/SAIJOCD/203";
link[4] = "/hall/detail/SAIJOCD/197";
rand = Math.floor(Math.random()*banner.length);
document.write("<a href="+link[rand]+"><img src="+banner[rand]+" style='border-style:none'></a>");
}