/* @TODO: alle aufrufe der anwendung umbiegen auf forms.js */
function toggleDisplay(id) {
    element = document.getElementById(id);
    if (element.style.display == 'none') {
        element.style.display = 'block';
    } else {
        element.style.display = 'none';
    }
}

function toggleVisibility(id) {
    var element = document.getElementById(id);
    if (element.style.visibility == 'visible') {
        element.style.visibility = 'hidden';
    } else {
        element.style.visibility = 'visible';
    }
}