function firstSelection() {
    var o = document.getElementsByTagName("img");
    var k = 0;
    for (var i = 0, n = o.length; i < n; i++) {
        if (o[i].className == "diapo" && k < 1) {
            k = 1;
            $(o[i]).mouseover();
        }
    }
}
function setSelection(selItem) {
    var o = document.getElementsByTagName("img");
    var k = 0;
    for (var i = 0, n = o.length; i < n; i++) {
        if (o[i].className == "diapo") {
            k = k + 1;
            if (k == selItem) {
                $(o[i]).mouseover();
            }
        }
    }
}