function showHide(w) {
    var span = document.getElementById(w + "_full");
    var a_obj = document.getElementById("a_" + w + "_show")
    if (!span || !a_obj) return false;
    if (a_obj.style.display != "none" && span.style.display == "none") {
        a_obj.style.display = "none"
        span.style.display = "";
    } else if (a_obj.style.display == "none" && span.style.display != "none") {
        a_obj.style.display = ""
        span.style.display = "none";        
    }
}