function feuilleOn(num) {
    if (num == 1) {
        pos = 'top right';
    } else if (num == 2) {
        pos = 'bottom left';
    } else if (num == 3) {
        pos = 'bottom right';
    }
    document.getElementById('house').style.background = 'url(gfx/layout/4maisons.gif) '+pos+' no-repeat';
}

function feuilleOff() {
    document.getElementById('house').style.background = 'url(gfx/layout/4maisons.gif) 0 0 no-repeat';
}