var imageActive = 0;
var totalImages = images.length;
function switchImage(iD) {
    var image = images[iD].image;
    $("#mainImage").attr('src', 'http://is0.gaslightmedia.com/brewbakers/hrv1/' + image);
    imageActive = iD;
    highlight(iD);
}
function highlight(iD){
    for (var i =0; i < totalImages; i++){
        if (iD == i) {
            $("#blockCount_"+i).addClass('highlight');
        } else {
            $("#blockCount_"+i).removeClass('highlight');
        }
    }
}
function prevImage() {
    if (imageActive - 1 >= 0) {
        imageActive--;
    } else {
        imageActive = (totalImages - 1);
    }
    switchImage(imageActive);
}
function nextImage() {
    if (imageActive + 1 <= (totalImages - 1)) {
        imageActive++;
    } else {
        imageActive = 0;
    }
    switchImage(imageActive);
}
highlight(0);