https://www.youtube.com/watch?v=f5m_6iK43Q0

concretehouse.me.js

var tColors = document.querySelectorAll('select#tColorSelector option');
var logoColors = document.querySelectorAll('select#logoColorSelector option');

window.setTimeout(function changeTshirt () {
    var i = parseInt( Math.random() * tColors.length );
    var colorId = tColors[i].className;
    var num = ('00' + colorId).slice(-3);
    $('#tBase img').attr('src', '/issue/okadada_t/images/t/' + num + '.jpg');

    var logoId = logoColors[parseInt( Math.random() * logoColors.length )].className;
    $('#tLogo img').attr('src', "/issue/okadada_t/images/okadada_" + logoId + ".png");

    window.setTimeout( changeTshirt, 33 );
}, 33);