$(window).load(function() {
    $('#slider').nivoSlider({
        effect: 'boxRandom,boxRain,boxRainReverse,boxRainGrow,boxRainGrowReverse', // Specify sets like: 'fold,fade,sliceDown'
        directionNav: false, // Next & Prev navigation
        controlNav: false, // 1,2,3... navigation
        pauseTime: 4000 // How long each slide will show
    });
});