var randomnumber = Math.floor(Math.random() * 5)

function setBackground() {
    switch (randomnumber) {
        case 0:
            document.body.style.background = 'url(/media/background/cases/bg_nestle_2.jpg) top center no-repeat';
            document.getElementById('case_nestle').style.display = 'block';
            break;
        case 1:
            document.body.style.background = 'url(/media/background/cases/bg_odense_2.jpg) top center no-repeat';
            document.getElementById('case_odense').style.display = 'block';
            break;
        case 2:
            document.body.style.background = 'url(/media/background/cases/bg_falck_2.jpg) top center no-repeat';
            document.getElementById('case_falck').style.display = 'block';
            break;
        case 3:
            document.body.style.background = 'url(/media/background/cases/bg_nivea_2.jpg) top center no-repeat';
            document.getElementById('case_nivea').style.display = 'block';
            break;
        case 4:
            document.body.style.background = 'url(/media/background/cases/bg_dsb.jpg) top center no-repeat';
            document.getElementById('case_dsb').style.display = 'block';
            break;
        default:
            document.body.style.background = 'url(/media/background/cases/bg_nivea_2.jpg) top center no-repeat';
            document.getElementById('case_nivea').style.display = 'block';
    }
}