var how_many_ads = 3;  
var now = new Date()  
var sec = now.getSeconds()  
var ad = sec % how_many_ads;  
ad +=1;  
var strad = '';

if (ad==1) {   
strad += '<a href="http://www.kzy666.com/home.asp" target="_blank" class="pic_link2"><img src="/flash/bjpImg/kzy48060.gif" width="480" height="60" border="0"></a>';
}
if (ad==2) {   
strad += '<img src="/flash/bjpImg/hqbjp_ad51260.gif" width="512" border="0">';
} 
if (ad==3) {   
strad += '<a href="http://www.dahanbang.com/" target="_blank" class="pic_link2"><img src="/flash/bjpImg/dhb46860.gif" width="468" border="0"></a>';
} 
document.write(strad);