var how_many_ads = 10 
var now = new Date() 
var sec = now.getSeconds() 
var ad = sec % how_many_ads; 
ad +=1; 
 
if (ad==1){ 
url="http://cdblyy.lhtzx.cn"; 
alt="丫丫成长足印";  
banner="/skins/xblue/pic/1.jpg"; 
width="960"; 
height="150"; 
} 

if (ad==2) {   
url="http://cdblyy.lhtzx.cn"; 
alt="丫丫成长足印";  
banner="/skins/xblue/pic/2.jpg";  
width="960"; 
height="150"; 
} 
  
if (ad==3) { 
url="http://cdblyy.lhtzx.cn"; 
alt="丫丫成长足印"; 
banner="/skins/xblue/pic/3.jpg"; 
width="960"; 
height="150"; 
}

if (ad==4) { 
url="http://cdblyy.lhtzx.cn"; 
alt="丫丫成长足印"; 
banner="/skins/xblue/pic/4.jpg"; 
width="960"; 
height="150"; 
}  

if (ad==5) { 
url="http://cdblyy.lhtzx.cn"; 
alt="丫丫成长足印"; 
banner="/skins/xblue/pic/5.jpg"; 
width="960"; 
height="150"; 
}  

if (ad==6) { 
url="http://cdblyy.lhtzx.cn"; 
alt="丫丫成长足印"; 
banner="/skins/xblue/pic/6.jpg"; 
width="960"; 
height="150"; 
}  

if (ad==7) { 
url="http://cdblyy.lhtzx.cn"; 
alt="丫丫成长足印"; 
banner="/skins/xblue/pic/7.jpg"; 
width="960"; 
height="150"; 
}  

if (ad==8) { 
url="http://cdblyy.lhtzx.cn"; 
alt="丫丫成长足印"; 
banner="/skins/xblue/pic/8.jpg"; 
width="960"; 
height="150"; 
}  

if (ad==9) { 
url="http://cdblyy.lhtzx.cn"; 
alt="丫丫成长足印"; 
banner="/skins/xblue/pic/9.jpg"; 
width="960"; 
height="150"; 
}  

if (ad==10) { 
url="http://cdblyy.lhtzx.cn"; 
alt="丫丫成长足印"; 
banner="/skins/xblue/pic/10.jpg"; 
width="960"; 
height="150"; 
}  
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><br>'); 
document.write('</center>'); 
-->