// gallery image switcher

Event.observe(window, 'load', init, false);

function init()
{
    // add listeners for clicks on all thumbs
    var nav = $('gallery');
    if (nav) {
        var imgs = $A(nav.getElementsByTagName('img'));
        imgs.each(function(img) {
            Event.observe(img, 'click', switchbg, false);
        });
        // set image to first of series
        Element.setStyle('top', {'backgroundImage': 'url(' + $('first').src + ')'});
    }
}

function switchbg(ev)
{
    var img = Event.element(ev);
    Element.setStyle('top', {'backgroundImage': 'url(' + img.src + ')'});
}