var adIds = new Array();
var adIndex = new Array();
function rotateAds(identifier, ids) {
    adIds[identifier] = ids;
    adIndex[identifier] = 0;
    setInterval(function() { rotateAd(identifier); }, 20000);
}
function rotateAd(identifier) {
    adIndex[identifier] = adIndex[identifier] == adIds[identifier].length - 1 ? 0 : adIndex[identifier] + 1;
    //alert(adIds[identifier][adIndex[identifier]]);
    $.ajax({
        type: "GET",
        url: "/Ad.ashx",
        data: "identifier=" + identifier + "&id=" + adIds[identifier][adIndex[identifier]],
        dataType: "html",
        success: function(html) {
            $("#" + identifier).replaceWith(html);
        }
    });
}