updateViewedAds()

function getCookie(c_name) {
    if (document.cookie.length>0) {
        c_start=document.cookie.indexOf(c_name + "=");
        if (c_start!=-1) {
            c_start=c_start + c_name.length+1;
            c_end=document.cookie.indexOf(";",c_start);
            if (c_end==-1) c_end=document.cookie.length;
            return unescape(document.cookie.substring(c_start,c_end));
        }
    }
    return "";
}

function updateViewedAds(){
    var viewedAdIds = getCookie('viewedAdIds');
    var tempArray = new Array();
    var adItem;
    var id;
    if (viewedAdIds) {
        var viewedAdArray = viewedAdIds.split(',');
        for(i=0;i<viewedAdArray.length;i++) {
            id='adItem' + viewedAdArray[i];
            adItem = document.getElementById(id);
            if (adItem) {
                adItem.className = adItem.className + ' adItem_viewed';
            }
        }
    }
}