function random_btn() {
banner = new Array();
banner[0] = "/shared/bnr/64toukan_takenotsuka125x125.jpg";
banner[1] = "/shared/bnr/31kennan_kennanhall125x125.jpg";
banner[2] = "/shared/bnr/103lifeland_lifecare_ishioka125x125.jpg";
banner[3] = "/shared/bnr/158lifeansaji_ishioka125x125.jpg";
banner[4] = "/shared/bnr/229tochigi_koga125x125.jpg";
banner[5] = "/shared/bnr/240saikan_sakaitenrei125x125.jpg";
banner[6] = "/shared/bnr/67toukan_kasukabe125x125.jpg";
banner[7] = "/shared/bnr/162sagamitenrei_sakaecho125x125.jpg";
banner[8] = "/shared/bnr/237saikan_ageo125x125.jpg";
banner[9] = "/shared/bnr/244newlife_kumagai125x125.jpg";
banner[10] = "/shared/bnr/212tochigi_utsunomiya125x125.jpg";
banner[11] = "/shared/bnr/76lifeland_lifecare_matsudo125x125.jpg";
banner[12] = "/shared/bnr/49heian_shouwa125x125.jpg";

link = new Array();
link[0] = "/hall/detail/SAIJOCD/64";
link[1] = "/hall/detail/SAIJOCD/31";
link[2] = "/hall/detail/SAIJOCD/103";
link[3] = "/hall/detail/SAIJOCD/158";
link[4] = "/hall/detail/SAIJOCD/229";
link[5] = "/hall/detail/SAIJOCD/240";
link[6] = "/hall/detail/SAIJOCD/67";
link[7] = "/hall/detail/SAIJOCD/162";
link[8] = "/hall/detail/SAIJOCD/237";
link[9] = "/hall/detail/SAIJOCD/244";
link[10] = "/hall/detail/SAIJOCD/212";
link[11] = "/hall/detail/SAIJOCD/76";
link[12] = "/hall/detail/SAIJOCD/49";

rand = Math.floor(Math.random()*banner.length);
document.write("<a href="+link[rand]+"><img src="+banner[rand]+" style='border-style:none'></a>");
}