var how_many_ads50060 = 4;  
var now50060 = new Date()  
var sec50060 = now50060.getSeconds()  
var ad50060 = sec50060 % how_many_ads50060;  
ad50060 +=1;  
var strad50060 = '';

if (ad50060==1) {   
 strad50060 += '<a href="http://www.ardun.com.cn/" target="_blank"><img src="/flash/index/yyyz_540_61.gif" alt="祛痘产品" width="540" border="0"></a>';
} 
if (ad50060==2) {   
 strad50060 += '<a href="http://www.12900.net/business/szs_6_%B7%C0%C9%B9%CB%AA.htm" target="_blank"><img src="/flash/12900/fs_46860.gif" alt="防晒霜"  width="468" height="60" border="0"></a>';
}  
if (ad50060==3) {   
 strad50060 += '<a href="http://www.12900.net/business/szs_6_%B7%C0%C9%B9%CB%AA.htm" target="_blank"><img src="/flash/12900/fs_46860.gif" alt="防晒霜"  width="468" height="60" border="0"></a>';
}  
if (ad50060==5) {   
 strad50060 += '<a href="/cosmetic/ph/" target="_blank"><img src="/flash/12900/ph51060.gif" width="510" alt="中国化妆品招商排行榜"  height="60" border="0"></a>';
} 
if (ad50060==4) {   
 strad50060 += '<a href="http://www.12900.net/zs_1_3_0.htm" target="_blank"><img src="/flash/12900/cz_55060.gif" width="550" height="60" border="0"></a>';
} 
document.write(strad50060);