var ads = [];
ads.push(['<a href="http://s.click.taobao.com/t_8?e=7HZ5x%2BOzcdM2Q%2BbyOFeKiZVilw%3D%3D&p=mm_10516638_0_0">\n'+
'<img width="690" height="80" alt="" src="http://www.xjdv.net/attachments/images/A690_80_1.jpg" />\n'+
'</a>', 0, 0]);
var index = Math.floor(Math.random()*ads.length);
var today = new Date();
var i = 0;
while(((ads[index][1] > 0 && ads[index][1] * 1000 > today) 
|| ((ads[index][2] > 0 && ads[index][2] * 1000 < today))) 
&& i < 30) {
index = Math.floor(Math.random()*ads.length);
i++;
}
document.write(ads[index][0]);