var _iframes, _objects;
var _hiddenIframes, _hiddenObjects;

function showMenu() {
    hideContent();
    document.getElementById('overlay').style.display = '';
    document.getElementById('mainMenu').style.display = '';
    document.getElementById('close').style.display = '';
}

function hideMenu() {
    document.getElementById('close').style.display = 'none';
    document.getElementById('mainMenu').style.display = 'none';
    document.getElementById('overlay').style.display = 'none';
    showContent();
}

function hideContent() {
    _iframes = document.getElementsByTagName("iframe");
    _objects = document.getElementsByTagName("object");
    if (_iframes.length > 0 || _objects.length > 0) {
        document.getElementById('page__content1').style.display = 'none';
    }
    for (var i=0; i<_iframes.length; i++) {
        if (_iframes[i].style.visibility != 'hidden') {
            _hiddenIframes += ',' + i + ',';
            _iframes[i].style.visibility = 'hidden';
        }
    }
    for (var i=0; i<_objects.length; i++) {
        if (_objects[i].style.visibility != 'hidden') {
            _hiddenObjects += ',' + i + ',';
            _objects[i].style.visibility = 'hidden';
        }
    }
}

function showContent() {
    document.getElementById('page__content1').style.display = '';
    for (var i=0; i<_iframes.length; i++) {
        if (_hiddenIframes.indexOf(',' + i + ',') >= 0) _iframes[i].style.visibility = 'visible';
    }
    for (var i=0; i<_objects.length; i++) {
        if (_hiddenObjects.indexOf(',' + i + ',') >= 0) _objects[i].style.visibility = 'visible';
    }
    _hiddenIframes = '';
    _hiddenObjects = '';
}