function random_btn() {
banner = new Array();
banner[0] = "/shared/bnr/247kansai_yasuragi125x125.jpg";
banner[1] = "/shared/bnr/248kansai_kitarokko125x125.jpg";
banner[2] = "/shared/bnr/22941kansai_keyaki125x125.jpg";
banner[3] = "/shared/bnr/22942kansai_sasayama125x125.jpg";
banner[4] = "/shared/bnr/50001feel_youaihall125x125.jpg";

link = new Array();
link[0] = "/hall/detail/SAIJOCD/247";
link[1] = "/hall/detail/SAIJOCD/248";
link[2] = "/hall/detail/SAIJOCD/22941";
link[3] = "/hall/detail/SAIJOCD/22942";
link[4] = "/hall/detail/SAIJOCD/50001";

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