function switchVisibility(obj) {
    var el = document.getElementById(obj);

    if ( el.style.display != "none" ) {
        el.style.display =
        'none';
    }

    else {
        el.style.display =
        '';
    }
}

function switchVisibilityCheckbox(obj, checkbox) {
    var el = document.getElementById(obj);

    if ( el.style.display != "none" && document.getElementById(checkbox).checked == true) {
        el.style.display =
        'none';
    }

    else if (document.getElementById(checkbox).checked == false) {
        el.style.display =
        '';
    }
}

function switchVisibilityCheckout(obj, checkbox) {
    var el = document.getElementById(obj);

    var style_attrib = window.document.createAttribute("style");
        style_attrib.nodeValue = "display: none;";
    //scDiv.attributes.setNamedItem(style_attrib);

    if (document.getElementById(checkbox).checked == true) {
        el.style.display =
        'none';
    }

    else if (document.getElementById(checkbox).checked == false) {
        el.style.display =
        '';
    }
}