var shown = "";

function clearOnFocus(e,y) {
    if (e.value == y){
        e.value = "";
    }
}

function repopOnBlur(e,y) {
    if (e.value == ""){
        e.value = y;
    }
}

function memberNumEnable(e) {
    document.getElementById(e).disabled = false;
}

function memberNumDisable(e) {
    document.getElementById(e).disabled = true;
}

function showAnswer(e) {
    
    if ( shown != e ) {
        if ( shown != "" ) {
            document.getElementById(shown).style.display = "none";
        }
        document.getElementById(e).style.display = "block";
        shown = e;
    } 
    
    else if ( shown == e ) {
        document.getElementById(e).style.display = "none";
        shown = "";
    }
}