function getHTTPObject() {

  var xmlhttp;
  
  if (window.XMLHttpRequest){
// IE7, Mozilla, Safari, etc: browsers decentes
		var xmlhttp = new XMLHttpRequest()
	}
else
{
if (window.ActiveXObject){
// …outro jeito, usando o ActiveX para IE5.x e IE6
	var xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
}
}
  return xmlhttp;

}

var http = getHTTPObject(); // We create the HTTP Object

function selecionaFaculdade() {
	
	var valor = document.getElementById("facul").value;
	http.open("POST", "busca.php", true);
	http.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
	http.send("faculdade="+valor);
	http.onreadystatechange = escreveFaculdade;
	
}

function escreveFaculdade() {


  	if (http.readyState != 4) {
  		//alert('dede');
  		//document.getElementById('carregando').style.display = "block"
      }
      
    if ((http.readyState == 4)&&(http.status==200)) {
    		var elemento = "turno";
   		   document.getElementById(elemento).innerHTML = http.responseText;
      }
  
}