$(window).load(function() {
    $('#slider').nivoSlider({
        effect: 'random', // Specify sets like: 'fold,fade,sliceDown'
        animSpeed: 500, // Slide transition speed
        pauseTime: 3000, // How long each slide will show
        directionNav: false, // Next & Prev navigation
        directionNavHide: true, // Only show on hover
        controlNav: false // 1,2,3... navigation
    });
});