function objetoAjax(){
  var xmlhttp=false;
  try {
  xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");
  } catch (e) {
  try {
  xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
  } catch (E) {
  xmlhttp = false;
  }
  }
  if (!xmlhttp && typeof XMLHttpRequest!='undefined') {
  xmlhttp = new XMLHttpRequest();
  }
  return xmlhttp;
}

function enviardt(){
  divResultad = document.getElementById('docentes');
  divFormulari = document.getElementById('for_docentes');
  sede=document.frmd.sede.value;
  
  ajax=objetoAjax();
  divResultad.innerHTML = '<p style="text-align:center;">Cargando</p>'; 
  ajax.open("POST", "alumnos/docentes/enviad.php",true);
  ajax.onreadystatechange=function(){
  	if (ajax.readyState==4){
  		divResultad.innerHTML = ajax.responseText;
		
		divFormulari.style.display="block";

/*  		divFormulario.innerHTML = "<p style="border:1px solid red; width:400px;">La actualizaci&oacute;n se realiz&oacute; correctamente</p>";
*/ 	}
  }
  ajax.setRequestHeader("Content-Type","application/x-www-form-urlencoded");
  ajax.send("sede="+sede);
}