function afComplete(event){

    if (window.AF_Queue.length == 0) {
        window.RunningAF = false;
     } else {
        var fn = window.AF_Queue.shift();
        fn();
    }
    return false;
}

function runAf(af) {
    if (!window.RunningAF) {
       window.RunningAF = true;
       af();

    } else {
        window.AF_Queue.push(af);
    }
}