function ajax(url) {
   req = null;

   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();
      }
   }
}

function processReqChange() {
   if (req.readyState == 1) {
      document.getElementById('registroCen').innerHTML = 'Carregando, por favor aguarde...';
   }
   else 
   if (req.readyState == 4) {      
   	  document.getElementById("registro").innerHTML = '';
      document.getElementById("bannerPar").innerHTML = '';      
   	  document.getElementById("registro").innerHTML = req.responseText;
   }
}

function aleatorio() {   	  
	aleat = Math.random()*3
   	aleat = Math.floor(aleat)
   	aleat = 1 + aleat
      
    if (aleat == 1)
       tipo = 'm'
    else
    if (aleat == 2)
       tipo = 'e'
    else
    if (aleat == 3)
       tipo = 'f'
   	carrega(tipo)
} 

function carrega(tipo) {
   url="includes/dir.php?tipodir='"+tipo+"'";
   ajax(url);
}