function random_banner() {
banner = new Array();
banner[0]="img/bnr/shogi_fighter.gif";
banner[1]="img/bnr/t_shrts.gif";
banner[2]="img/bnr/ad_300_240.gif";
banner[3]="img/bnr/shogi_check.gif";
message = new Array();
message[0]="将棋ファイター";
message[1]="オリジナルＴシャツ販売開始!!";
message[2]="広告募集";
message[3]="あなたの将棋脳をチェックする！";
link = new Array();
link[0] = "shogifighter.php";
link[1] = "http://www.ttrinity.jp/shop/studiozombie/";
link[2] = "ad.php";
link[3] = "shogi_check.php";
rand = Math.floor(Math.random()*banner.length);
document.write("<a target='_top' href="+link[rand]+"><img alt="+message[rand]+" src="+banner[rand]+" style='border-style:none'></a>");
}