var num = 4;
var Ads = new Array( );

        Ads[0] = ( '<iframe frameborder="0" allowtransparency="true" height="150" width="180" marginheight="0" scrolling="no" src="http://ad.jp.ap.valuecommerce.com/servlet/htmlbanner?sid=2526215&pid=878318799" marginwidth="0"><script language="javascript" src="http://ad.jp.ap.valuecommerce.com/servlet/jsbanner?sid=2526215&pid=878318799"></script><noscript><a href="http://ck.jp.ap.valuecommerce.com/servlet/referral?sid=2526215&pid=878318799" target="_blank" ><img src="http://ad.jp.ap.valuecommerce.com/servlet/gifbanner?sid=2526215&pid=878318799" height="150" width="180" border="0"></a></noscript></iframe>' );
        Ads[1] = ( '<iframe frameborder="0" allowtransparency="true" height="150" width="180" marginheight="0" scrolling="no" src="http://ad.jp.ap.valuecommerce.com/servlet/htmlbanner?sid=2526215&pid=878318800" marginwidth="0"><script language="javascript" src="http://ad.jp.ap.valuecommerce.com/servlet/jsbanner?sid=2526215&pid=878318800"></script><noscript><a href="http://ck.jp.ap.valuecommerce.com/servlet/referral?sid=2526215&pid=878318800" target="_blank" ><img src="http://ad.jp.ap.valuecommerce.com/servlet/gifbanner?sid=2526215&pid=878318800" height="150" width="180" border="0"></a></noscript></iframe>' );
        Ads[2] = ( '<iframe frameborder="0" allowtransparency="true" height="150" width="180" marginheight="0" scrolling="no" src="http://ad.jp.ap.valuecommerce.com/servlet/htmlbanner?sid=2526215&pid=878456026" marginwidth="0"><script language="javascript" src="http://ad.jp.ap.valuecommerce.com/servlet/jsbanner?sid=2526215&pid=878456026"></script><noscript><a href="http://ck.jp.ap.valuecommerce.com/servlet/referral?sid=2526215&pid=878456026" target="_blank" ><img src="http://ad.jp.ap.valuecommerce.com/servlet/gifbanner?sid=2526215&pid=878456026" height="150" width="180" border="0"></a></noscript></iframe>' );
        Ads[3] = ( '<iframe frameborder="0" allowtransparency="true" height="150" width="180" marginheight="0" scrolling="no" src="http://ad.jp.ap.valuecommerce.com/servlet/htmlbanner?sid=2526215&pid=878318806" marginwidth="0"><script language="javascript" src="http://ad.jp.ap.valuecommerce.com/servlet/jsbanner?sid=2526215&pid=878318806"></script><noscript><a href="http://ck.jp.ap.valuecommerce.com/servlet/referral?sid=2526215&pid=878318806" target="_blank" ><img src="http://ad.jp.ap.valuecommerce.com/servlet/gifbanner?sid=2526215&pid=878318806" height="150" width="180" border="0"></a></noscript></iframe>' );

Rnd = Math.floor( Math.random ( ) * num );
document.write( Ads[Rnd] );