Event.observe(window, 'load', function() {
    $$('#nav li').each(function(item) {
        Event.observe(item, 'click', menuOnClick.bindAsEventListener(item));
    });
});

function menuOnClick(e) {
    var ce = this.childElements();
    if(ce.length > 0) {
        var href = ce[0].href;
        window.document.location = href;
    }
}

function galleryPrev() {
    if(currentPhoto > 0) {
        currentPhoto = currentPhoto - 1;
    }
    var phs = $$('#gallery-thumbnails a');
    $('big-photo').src= phs[currentPhoto].href;
}

function galleryNext() {
    currentPhoto = currentPhoto + 1;
    var phs = $$('#gallery-thumbnails a');
    if(currentPhoto >= phs.length) {
        currentPhoto = phs.length > 0 ? phs.length-1 : 0;
    }
    $('big-photo').src= phs[currentPhoto].href;
}