function showEnhancedThumbnail(ad_id)
{
    var normal = getObj('img-'+ad_id);
    var enhanced = getObj('img-'+ad_id+'-e');
    if (!is_object(normal) || !is_object(enhanced)) 
        return false;
    var nT = normal.offsetTop;
    var nH = normal.offsetHeight;
    var nL = normal.offsetLeft;
    var nW = normal.offsetWidth;
    enhanced.style.display = '';
    enhanced.style.position = 'absolute';
    enhanced.style.top = ((nT + (nH / 2)) - (enhanced.offsetHeight / 2)) + 'px';
    enhanced.style.left = ((nL + (nW / 2)) - (enhanced.offsetWidth / 2)) + 'px';
}
function hideEnhancedThumbnail(ad_id) {
    var enhanced = getObj('img-'+ad_id+'-e');
    if (!is_object(enhanced))
        return false;
    enhanced.style.display = 'none';
}