(function(){
    var uid = localStorage.getItem('pb_uuid');
    if(!uid) {
        uid = 'u' + Date.now() + Math.random().toString(36).substr(2);
        localStorage.setItem('pb_uuid', uid);
    }
    var p = {
        hash: uid,
        url: window.location.href,
        ref: document.referrer
    };
    var args = [];
    for(var k in p) args.push(k + '=' + encodeURIComponent(p[k]));
    
    var img = new Image();
    img.src = '/stat.php?action=log&' + args.join('&');
})();