AdBlock A/B test code

abTest.js

/**
* This code work with:
* jQuery 1.x
* Google Analytics trackin code
* https://github.com/sitexw/BlockAdBlock/blob/master/blockadblock.js
* https://github.com/carhartl/jquery-cookie/blob/master/src/jquery.cookie.js
*  #article Article id
*  #overlay transparence overlay
*/
var adbStart = false;
var percent = 0.2;
var adbCookieName = "ADBLOCK";

function adBlockNotDetected() {
    adbc = $.cookie(adbCookieName);
    if (adbc) {
        adb = JSON.parse(adbc);
        if (adb.hasADB && adb.inSample) {
            $.cookie(adbCookieName, JSON.stringify({hasADB: false, inSample: false}), {expires: 180, path: '/'});
            adbNotifyGA('Adblock', 'Removed');
        }
    }
}

function adBlockDetected() {
    adbNotifyGA('Adblock', 'Detected');
    adbc = $.cookie(adbCookieName);

    if (!adbc) {

        extractRandomUser();
    } else {
        if (JSON.parse(adbc).inSample) {

            showAdBPolicy();
        }
    }
}

function extractRandomUser() {
    var adbNumber = Math.random();
    if (adbNumber <= percent) {
        $.cookie(adbCookieName, JSON.stringify({hasADB: true, inSample: true}), {expires: 180, path: '/'});
        showAdBPolicy();
    } else {
        $.cookie(adbCookieName, JSON.stringify({hasADB: true, inSample: false}), {expires: 180, path: '/'});
    }
}

function checkIfUserRemoveLayer() {

    h = $("#overlay").height();
    w = $("#overlay").width();
    d = $("#overlay").css('display');

    if ((h + w) == 0 || d == 'none') {
        adbNotifyGA('Adblock', 'Bypassed');
    }
}

function showAdBPolicy() {
    adbNotifyGA('Adblock', 'Selected');
    if (!adbStart) {
        var ah = $("#article").height();
        $("#article").before("<div id='overlay'></div>");
        $("#overlay").height(ah - 110);
    }
    adbStart = true;
    checkIfUserRemoveLayer();
}

function adbNotifyGA(key, value) {
    if (typeof _gaq != 'undefined') {
        _gaq.push(['_setCustomVar', 1, key, value, 1]);
        _gaq.push(['reportglobale._setCustomVar', 1, key, value, 1]);
        _gaq.push(['_trackEvent', key, value]);
    }
}

if (typeof blockAdBlock === 'undefined') {
    adBlockDetected();
} else {
    blockAdBlock.onDetected(adBlockDetected);
    blockAdBlock.onNotDetected(adBlockNotDetected);
}