function swapElement( id ) {
    swapElementByEl( document.getElementById( id ) );
}

function swapSubform( radio_el, id ) {
    el = document.getElementById( id );
    if( radio_el.checked ) {
        el.style.display = "block";
    } else {
        el.style.display = "none";
    }
}

function swapElementByEl( el ) {
    if( el.style.display == "none" || el.style.display == ""  ) {
        el.style.display = "block";
    } else {
        el.style.display = "none";
    }
}