BAIDU_CLB_SLOT_ID = "172042";

if(document.cookie.indexOf('xdowns') == -1)
{
var lailu=document.referrer;
reg="http://";//来路的URL主机地址
var myreg=new RegExp(reg);
if (myreg.test(lailu)){
document.writeln("<script type=\"text\/javascript\" src=\"http:\/\/cbjs.baidu.com\/js\/o.js\"><\/script>");	

}

}