var ad = new Array();
//新幹線上
ad[0]='<IFRAME frameBorder="0" allowTransparency="true" height="60" width="468" marginHeight="0" scrolling="no" src="http://ad.jp.ap.valuecommerce.com/servlet/htmlbanner?sid=2118592&pid=871643775" MarginWidth="0"><script Language="javascript" Src="http://ad.jp.ap.valuecommerce.com/servlet/jsbanner?sid=2118592&pid=871643775"></script><noscript><a Href="http://ck.jp.ap.valuecommerce.com/servlet/referral?sid=2118592&pid=871643775" target="_blank" ><img Src="http://ad.jp.ap.valuecommerce.com/servlet/gifbanner?sid=2118592&pid=871643775" height="60" width="468" Border="0"></a></noscript></IFRAME>';
//ダイミテイ上
ad[1]='<IFRAME frameBorder="0" allowTransparency="true" height="60" width="468" marginHeight="0" scrolling="no" src="http://ad.jp.ap.valuecommerce.com/servlet/htmlbanner?sid=2118592&pid=871508850" MarginWidth="0"><script Language="javascript" Src="http://ad.jp.ap.valuecommerce.com/servlet/jsbanner?sid=2118592&pid=871508850"></script><noscript><a Href="http://ck.jp.ap.valuecommerce.com/servlet/referral?sid=2118592&pid=871508850" target="_blank" ><img Src="http://ad.jp.ap.valuecommerce.com/servlet/gifbanner?sid=2118592&pid=871508850" height="60" width="468" Border="0"></a></noscript></IFRAME>';

var r = Math.floor(ad.length * Math.random());
document.write(ad[r]);