function showhide(id, total) {
    for (var i = 0; i < total; i++) {
        var element = document.getElementById("img" + i);
        if (("img" + i) == id) {
            element.style.display = (!element.style || (element.style.display != "block")) ? "block" : "none";
        } else {
            element.style.display = "none";
        }
    }
}