<SCRIPT LANGUAGE="JavaScript1.2">
var how_many_ads = 4;
var now = new Date();
var sec = now.getSeconds();
var ad = sec % how_many_ads;
ad +=1;
if (ad==1) {
var msg4="<a href=http://ayuanweb.jahee.com/leadbbs target=_blank><img src=http://ayuanweb.jahee.com/pic/qqbanner.gif border=0 width=468 height=60 alt=QQ会员></a>"
document.write(msg4) }
if (ad==2) {
var msg4="<a href=http://ayuanweb.jahee.com/leadbbs/Announce/Announce.asp?BoardID=10&ID=81 target=_blank><img src=http://ayuanweb.jahee.com/pic/ad.gif border=0 width=468 height=60 alt=申请版主></a>"
document.write(msg4) }
if (ad==3) {
var msg4="<a href=http://ayuanweb.jahee.com/fd/ target=_blank><img src=http://ayuanweb.jahee.com/pic/fd.jpg border=0 width=468 height=60 alt=防治非典></a>"
document.write(msg4) }
if (ad==4) {
var msg4="<a href=http://www.pageunion.com/ad/sale.php?ref=9664 target=_blank><img src=http://www.hotwinfo.com/img/banner_1.gif border=0 width=468 height=60 alt=万维建站-虚拟主机></a>"
document.write(msg4) }
</script>
是这个吗？