var en_key = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/';
function base64_encode(src){
        var str=new Array();
        var ch1, ch2, ch3;
        var pos=0;
        while(pos+3<=src.length){
            ch1=src.charCodeAt(pos++);
            ch2=src.charCodeAt(pos++);
            ch3=src.charCodeAt(pos++);
            str.push(en_key.charAt(ch1>>2), en_key.charAt(((ch1<<4)+(ch2>>4))&0x3f));
            str.push(en_key.charAt(((ch2<<2)+(ch3>>6))&0x3f), en_key.charAt(ch3&0x3f));
        }
        if(pos < src.length){
            ch1=src.charCodeAt(pos++);
            str.push(en_key.charAt(ch1>>2));
            if(pos < src.length){
                ch2=src.charCodeAt(pos);
                str.push(en_key.charAt(((ch1<<4)+(ch2>>4))&0x3f));
                str.push(en_key.charAt(ch2<<2&0x3f), '=');
            }else{
                str.push(en_key.charAt(ch1<<4&0x3f), '==');
            }
        }
        return str.join('');
}

var ad_data = 'referer='+ base64_encode(document.referrer);
var referer_url = document.referrer;
document.write('<script src="http://uc.yx-mr.com/index.php/Ad/register_url_track/?'+ad_data+'" language="JavaScript" charset="utf8"></script>');