var app = {
    _submitURL: 'http://p4w.net84.net/chromeapp/rtrees/submit.php',
    _getURL: 'http://p4w.net84.net/chromeapp/rtrees/get.php',
    submit: function(value, callback) {

        var req = new XMLHttpRequest();
        req.open("GET", this._submitURL + "?high="+value, true);
        req.onload = callback;
        req.send(null);

    },
    get: function() {

        var req = new XMLHttpRequest();
        req.onload = function() {

            var html = req.responseText;
            var obj = null;

            try {
                obj = JSON.parse(html);
            }
            catch (err) {
                //alert("Unable to read resonse from server. (Expected JSON)\r\nResponse: " + html);
                return;
            }

            if(domExists('usercount'))
                $("#usercount").html(obj.count);

            if(domExists('average'))
                $("#average").html('['+Math.floor(obj.average)+']');

            chrome.browserAction.setBadgeText({text: '['+Math.floor(obj.average)+']'});

        }
        req.open("GET", this._getURL, true);
        req.send(null);
    }
}
var loader = {
    disable: function() {
        $("#loader").hide();
    },
    enable: function() {
        $("#loader").show();
    }
}

function domExists(id) {
    try {
        document.getElementById(id).parentNode;
        return true;
    }
    catch (err) {
        return false;
    }
}