$('a.introVid').click(function () {
    autoPlayVideo('XGSy3_Czz8k', '420', '345');
});

function autoPlayVideo(vcode, width, height) {
    first = true;
    startTime();
    "use strict";
    $("#videoContainer").html('<iframe width="' + width + '" height="' + height + '" src="https://www.youtube.com/embed/' + vcode + '?autoplay=1&loop=1&rel=0&wmode=transparent" frameborder="0" allowfullscreen wmode="Opaque"></iframe>');
}

var h1,m1,s1 = 0;
var first = true;
function startTime() {
    var today=new Date();
    h=today.getHours();
    m=today.getMinutes();
    s=today.getSeconds();
    if (first)
    {
        h1 = h;
        m1 = m;
        s1 = s;
        first = false;
    }
    h -= h1;
    m -= m1;
    s -= s1;
    m = checkTime(m);
    s = checkTime(s);
    document.getElementById('txt').innerHTML = h + ":" + m + ":" + s;
    var t = setTimeout(function(){startTime()},500);
}

function checkTime(i) {
    if (i<10) {i = "0" + i};  // add zero in front of numbers < 10
    return i;
}