function addNews(){
/*document.write('<div id="news" style="width:100%;"></div>');*/
document.write('<iframe src="http://www.mundodomarketing.com.br/noticias/addNewsVertical.php" width="180" height="334" marginheight="0" marginwidth="0" frameborder="0" scrolling="no"></iframe>');

<!-- AJAX - CRIA OBJETO -->
/*var XMLHttpRequestObject = false;
	
try{
	XMLHttpRequestObject = new ActiveXObject("MSXML2.XMLHTTP");
} catch(exception1) {
	try{
		XMLHttpRequestObject = new ActiveXObject("Microsoft.XMLHTTP");
	} catch(exception2) {
		XMLHttpRequestObject = false;
	}
}

if(!XMLHttpRequestObject && window.XMLHttpRequest){
	XMLHttpRequestObject = new XMLHttpRequest();
}
<!-- AJAX - CRIA OBJETO -->

var local = document.getElementById('news');
var url = "http://www.mundodomarketing.com.br/addNewsVertical.php";

XMLHttpRequestObject.open("GET", url, true);	
XMLHttpRequestObject.onreadystatechange = function(){		
		var conteudo = XMLHttpRequestObject.responseText;
		local.innerHTML = conteudo;
}
	
XMLHttpRequestObject.send(null);*/
}

addNews();