代码如下:

<script language=javascript>

var how_many_ads = 5

var now = new date()

var sec = now.getseconds()

var ad = sec % how_many_ads;

ad +=1;

if (ad==1){

url=;

alt=ad1;

banner=图片/01.jpg;

width=440;

height=230;

}

if (ad==2) {

url=;

alt=ad2;

banner=图片/02.jpg;

width=440;

height=230;

}

if (ad==3) {

url=;

alt=ad3;

banner=图片/03.jpg;

width=440;

height=230;

}

if (ad==4) {

url=;

alt=ad4;

banner=images/04.jpg;

width=440;

height=230;

}

if (ad==5) {

url=;

alt=ad5;

banner=图片/05.jpg;

width=440;

height=230;

}

document.write('<center>');

document.write('<a href=\' + url + '\ target=\_blank\>');

document.write('<img src=\' + banner + '\ width=')

document.write(width + ' height=' + height + ' ');

document.write('alt=\' + alt + '\ border=0>

');

document.write('</center>');

--></script>