var imgnr = 1;
var nrImagini = 4;
var interval;
function startSpinner() {
    interval = setInterval('changeBanner(0)', 5000);
}
function stopSpinner() {
    clearInterval(interval);
}
function changeBanner(v) {
    if (v != 0) { // -1 = stanga ; 1 = dreapta
        imgnr = imgnr + v;
    } else
        imgnr = imgnr + 1;
    if (imgnr <= 0)
        imgnr = nrImagini;
    if (imgnr > nrImagini)
        imgnr = 1;
    document.getElementById("imgBanner").src = "Resources/Banner/" + imgnr + ".png";
}