//if (window.location.href=="http://www.uubook.com/" || window.location.href=="http://uubook.com/" || //window.location.href=="http://www.uubook.com/index.html" || //window.location.href=="http://uubook.com/index.html"){ 
//document.write("<img src=\"\/js\/gy1.gif\" border=\"0\" >");
//}
//else{
//document.write("<img src=\"\/js\/gy1.gif\" border=\"0\" >");
//}


var how_many_ads = 3
var now = new Date() 
var sec = now.getSeconds() 
var ad = sec % how_many_ads; 
ad +=1; 
//**************************** 广告一 **************** 
if (ad==1){ 
document.write("<img src=\"\/js\/gy1.gif\" border=\"0\" >");
} 
//**************************** 广告二 **************** 

if (ad==2) { 
dd_ad_output="textlink";
dd_ad_client="P-282872";
dd_ad_id=63;
dd_ad_format=30;
document.write("<script type=\"text\/javascript\" src=\"http:\/\/union.dangdang.com\/union\/script\/dd_ads.js\" ><\/script>");
} 

//**************************** 广告三 **************** 
if (ad==3) { 
dd_ad_output="textlink";
dd_ad_client="P-282872";
dd_ad_id=63;
dd_ad_format=30;
document.write("<script type=\"text\/javascript\" src=\"http:\/\/union.dangdang.com\/union\/script\/dd_ads.js\" ><\/script>");

}