function abrirDocumento(div, doc){  
	var url = doc;  
	target = div;  
	xmlRequest.open("GET", url, true);  
	xmlRequest.onreadystatechange = mudancaEstado;  
	xmlRequest.send(null);  
	  
	if(xmlRequest.readyState == 1) {  		
		document.getElementById(target).innerHTML = "<img src='imagens/loading.gif' width='50' height='50'>";  		
	}  
	  
	return url;  
	
}  
 
function mudancaEstado(){  
	if(xmlRequest.readyState == 4){  
		document.getElementById(target).innerHTML = xmlRequest.responseText;
	}  
}