function showHide(boxid) {
    for (i = 1; i <= 3; i++) {
        document.getElementById("sa" + i).style.display = "none";
    }
    var obj = document.getElementById(boxid);

    if (obj.style.display == "block" || obj.style.display == "") {
        obj.style.display = "none";
    }
    else {
        obj.style.display = "block";
    }
}