function sdAd(){
		document.getElementById('showingId').style.visibility = 'hidden';
    	document.getElementById('wrapper').style.display = 'block';    
    	document.getElementById('adimg').style.visibility = 'hidden';
    	document.getElementById('adimg').width = 0;
    	document.getElementById('adimg').height = 0;
}
function showAd(urlstring){
			document.getElementById('bobo').src = urlstring;
			document.getElementById('bobo').height = 6998;
}