function synchroniseBackgroundWithAudio(bgi, target) {
    var cnt = document.getElementById(target || 'BackgroundImage') || document.getElementById('container'),
        bga = document.getElementById('BackgroundAudio'),
        rdy = false,
        bgs = [];

    if(!cnt)
        return;

    var computed = getComputedStyle(cnt);

    if(computed.backgroundImage && target !== 'ForegroundImage')
        bgs = computed.backgroundImage.split(',');

    if(!bga) {
        bgs.splice(0, 0, 'url(' + bgi + ')');
        cnt.style.backgroundImage = bgs.join(',');
        return;
    }

    var onReady = function(url) {
        bgs.splice(0, 0, 'url(' + url + ')');
        cnt.style.backgroundImage = bgs.join(',');
        bga.play();
    };

    bga.addEventListener('canplay', function() {
        rdy = true;
    });

    bga.pause();
    bga.currentTime = 0;

    var xhr = new XMLHttpRequest;
    xhr.responseType = 'blob';
    xhr.onreadystatechange = function() {
        if(xhr.readyState !== 4)
            return;
        bgi = URL.createObjectURL(xhr.response);

        if(rdy)
            onReady(bgi);
        else
            bga.addEventListener('canplay', function() {
                onReady(bgi);
            });
    };
    xhr.open('GET', bgi);
    xhr.send();
}