$(document).ready(function() {
    $('#slideshow').nivoSlider({
        controlNav: false,
        directionNav: false,
        pauseTime: 5000,
    });
    $('#loga img').mouseover(function(){
        $(this).stop().animate({opacity: 1}, '100');
    });
    $('#loga img').mouseout(function(){
        $(this).stop().animate({opacity: 0}, '100');
    });
});