var protocolType = document.location.protocol; 
function showImg_168(obj) {
    if (typeof(adObj_168) !== 'undefined') {
        document.getElementById(adObj_168).innerHTML = "";
    } else {
        obj.parentNode.innerHTML = "";
    }
}

var imgObj = '<span><img src="" onload="showImg_168(this)" style="display:none" /></span>';
document.write(imgObj);