var iadA = new Array(
'<a href=http://WWW.4P.COM.TW target=_blank><img src=/site_media/images/ad/190x79_4Pyear.gif border=0 style="border:0px #000000 solid"></a>',
'<a href=http://www.settour.com.tw/GSet/GFG/GFG_Index.asp?iMGRUP_CD=CHATSNAP5&iSUB_CD=GO target=_blank><img src=/site_media/images/ad/190x79_classicbj.gif border=0 style="border:0px #000000 solid"></a>'
);
index = Math.floor(Math.random() * iadA.length)
document.write(iadA[index])