// JavaScript Document
var how_many_ads = 3; 
var now = new Date() 
var sec = now.getSeconds() 
var ad = sec % how_many_ads; 
ad +=1; 
if (ad==1) { 
txt=""; 
url="http://bbs.ttjk.com/register.aspx"; 
alt="天天健康论坛"; 
banner="http://www.ttjk.com/swgg/360x100/images/1.gif"; 
width="360"; 
height="100"; 
} 
if (ad==2) { 
txt=""; 
url="http://bbs.ttjk.com/register.aspx"; 
alt="天天健康论坛注册"; 
banner="http://www.ttjk.com/swgg/360x100/images/1.gif"; 
width="360"; 
height="100"; 
} 
if (ad==3) { 
txt=""; 
url="http://bbs.ttjk.com/register.aspx"; 
alt="天天健康论坛会员注册"; 
banner="http://www.ttjk.com/swgg/360x100/images/1.gif"; 
width="360"; 
height="100";  
} 
document.write('<a href="' + url + '" target="_blank">'); 
document.write('<img src="' + banner + '" width=') 
document.write(width + ' height=' + height + ' '); 
document.write('alt="' + alt + '" border=0></a>');