function random_btn() {
banner = new Array();
banner[0] = "/shared/bnr/13aiplan_nishimachi125x125.jpg";
banner[1] = "/shared/bnr/71houon_shirogane125x125.jpg";
banner[2] = "/shared/bnr/209iwate_moriokachouanden125x125.jpg";
banner[3] = "/shared/bnr/43heian_yamagata125x125.jpg";
banner[4] = "/shared/bnr/47heian_sagae125x125.jpg";
banner[5] = "/shared/bnr/107lifeland_lifecare_yoshimakaidou125x125.jpg";
banner[6] = "/shared/bnr/123lifeansaji_saikon125x125.jpg";
banner[7] = "/shared/bnr/138lifeansaji_fukushimafamily125x125.jpg";
banner[8] = "/shared/bnr/111lifeland_lifecare_onahama125x125.jpg";
banner[9] = "/shared/bnr/127lifeansaji_kooriyama125x125.jpg";
banner[10] = "/shared/bnr/144lifeansaji_sagamibange125x125.jpg";
banner[11] = "/shared/bnr/155lifeansaji_kahoku125x125.jpg";

link = new Array();
link[0] = "/hall/detail/SAIJOCD/13";
link[1] = "/hall/detail/SAIJOCD/71";
link[2] = "/hall/detail/SAIJOCD/209";
link[3] = "/hall/detail/SAIJOCD/43";
link[4] = "/hall/detail/SAIJOCD/47";
link[5] = "/hall/detail/SAIJOCD/107";
link[6] = "/hall/detail/SAIJOCD/123";
link[7] = "/hall/detail/SAIJOCD/138";
link[8] = "/hall/detail/SAIJOCD/111";
link[9] = "/hall/detail/SAIJOCD/127";
link[10] = "/hall/detail/SAIJOCD/144";
link[11] = "/hall/detail/SAIJOCD/155";
rand = Math.floor(Math.random()*banner.length);
document.write("<a href="+link[rand]+"><img src="+banner[rand]+" style='border-style:none'></a>");
}