function parseUri (str) {
    var keys   =  ["source","protocol","authority","userInfo","user","password","host","port","relative","path","directory","file","query","anchor"];
    var uri_re =  /^(?:([^:\/?#]+):)?(?:\/\/((?:(([^:@]*)(?::([^:@]*))?)?@)?([^:\/?#]*)(?::(\d*))?))?((((?:[^?#\/]*\/)*)([^?#]*))(?:\?([^#]*))?(?:#(.*))?)/;
    var m   = uri_re.exec(str);

    var uri = {};
    for (i=0; i<14; i++) {
      uri[keys[i]] = m[i] || "";
    }
  
    uri["queries"] = {};
    uri["query"].replace(/(?:^|&)([^&=]*)=?([^&]*)/g, function ($0, $1, $2) {
      if ($1) {
        uri["queries"][$1] = $2;
      }
    })
  
    return uri;
};

var scripts = document.getElementsByTagName('script');
var index = scripts.length - 1;
var currentScript = scripts[index];
var uri = parseUri(currentScript.src);

if (uri["queries"]["p"] != undefined)
{
  var ref = escape(window.location.href);
  var sub = (uri["queries"]["sub"]==undefined)? "":uri["queries"]["sub"];
  document.write("<img src='" + uri["protocol"]+"://"+uri["host"]+"/"+uri["queries"]["p"]+"?sub="+sub+"&ref="+ref+"' height='1' width='1' />");
}