function getContent(iframe) {
    var content = '';
    if (iframe.contentDocument) {
      content = iframe.contentDocument.body.innerHTML; 
    } else if (iframe.contentWindow) {
      content = iframe.contentWindow.document.body.innerHTML;
    } else if (iframe.document) {
      content = iframe.document.body.innerHTML;
    }
    return content;
}
function onLoadFrame(){
 	if (getContent(document.getElementById('hidden')) != '') {
		document.getElementById("ad_leaderboard").innerHTML = getContent(document.getElementById('hidden'));
	}
}
function setContent(url) {
    frames['hidden'].location = url;
}