$(function () {
    setInterval(AutoSwitchAD, 5000); 
});

function AutoSwitchAD() {
    var currentAd = $(".adverSelect .adverSelected");
    var currentAdNumber = currentAd.attr("id").substring(6, 7);
    currentAdNumber++;
    if (currentAdNumber > 5) {
        currentAdNumber = 1;
    }

    SwitchAD(currentAdNumber, "ad_btn" + currentAdNumber);
}

function SwitchAD(number, id) {

    $(".adverBg").hide();
    $(".adverBg").css('background', 'url(/Images/AD' + number + '.jpg)');
    $(".adverBg").fadeIn(500);
    $(".adverBg").css('position', '');

    $(".adverSelect h1").attr("class", "");
    $("#" + id).attr("class", "adverSelected");
}