function ajax(url,div,msgCarregando) { 
req = null;
document.getElementById(div).innerHTML = carregando(msgCarregando);
if (window.XMLHttpRequest) { 
 req = new XMLHttpRequest(); 
 req.onreadystatechange = processReqChange; 
 req.open("GET",url,true); 
 req.send(null); 
 }else if (window.ActiveXObject) { 
    req = new ActiveXObject("Microsoft.XMLHTTP"); 
    if (req) { 
    req.onreadystatechange = processReqChange; 
    req.open("GET",url,true); 
    req.send(null); 
    } 
  } 
} 

function processReqChange(){ 
if (req.readyState == 4){ 
  if (req.status ==200){
  document.getElementById(div).innerHTML = req.responseText; 
  }else{ 
  alert("Houve um problema ao obter os dados:n" + req.statusText); 
  } 
 } 
} 
function carregando(valor){
	var retorno;
	if(valor == "") retorno = "Carregando..."; else retorno = valor;
		return '<table width=50% align=center border=1>'+
		 '<tr align=center>'+
		  '<td class=TITULO1>'+valor+'</td>'+
		 '</tr>'+
		'</table>';
}