function hideAll() {
    document.itemDetailsBlock = document.getElementById("thumbnail-photos");
    document.itemDetails = document.itemDetailsBlock.getElementsByTagName("img");
    for (var ti=0;ti<document.itemDetails.length;ti++) {
        var itemDetail = document.itemDetails[ti];
        itemDetail.src="../media/images/gallery/" + gallery + (ti+1) + "sm_off.jpg" ;
    }
}

function showPhoto(ID) {
    hideAll();
    document.getElementById("thumbnail-photo-"+ID).src = "../media/images/gallery/" + gallery + ID + "sm_on.jpg";
    document.getElementById("large-photo").src = "../media/images/gallery/" + gallery + ID + "_lg.jpg";
}