function random_banner() {
banner = new Array();
banner[0]="img/sponsor/hokkaidofamily_230_230.gif";
banner[1]="img/sponsor/ad_230_230.gif";
banner[2]="img/sponsor/ad_230_230.gif";
message = new Array();
message[0]="アフラックサービスショップ帯広西12条店北海道ファミリー道東営業所提供『Luckey☆を見つけよう!』";
message[1]="広告募集";
message[2]="広告募集";
link = new Array();
link[0] = "http://www.jaga.fm/bg_list.php?p=5";
link[1] = "cm_ad.php";
link[2] = "cm_ad.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>");
}