experiment.js

var experiments = {
    "YvvWWQlbSLSUqKvi6YD": [
        function() {},
        function() {
            $("#support-nav").html("Support");
        }
    ],
    "CeK01Si7S_m_c7iYjyu9Nw": [
        function() {},
        function() {
            $("h1").addClass("new-header-font");
        }
    ]
};

function getExperiment() {
    var acksinExp = localStorage.getItem("acksinExperiments");

    // Get a new experiment
    if(acksinExp == null) {
        var expKeys = Object.keys(experiments);
        acksinExp = expKeys[Math.floor(Math.random() * expKeys.length)];

        localStorage.setItem("acksinExperiments", acksinExp);
        return acksinExp;
    }

    // Check if experiment is still running, if it is get it.
    if(acksinExp in experiments) {
        return acksinExp;
    }

    // Remove the existing experiment and recurse so we can get the new experiment.
    localStorage.removeItem("acksinExperiments");
    return getExperiment();
}

$.getScript("//www.google-analytics.com/cx/api.js?experiment=" + getExperiment(), function(){
    chosenVariation = cxApi.chooseVariation();
    experiments[getExperiment()][chosenVariation]();
});