/*----------------------------------------------------------------*/
function ajaxInit() {

  var xmlhttp;

  try {
     xmlhttp = new XMLHttpRequest();
  } catch(ee) {
     try {
        xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");
     } catch(e) {
        try {
           xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
        } catch(E) {
           xmlhttp = false;
        }
     }
  }

  return xmlhttp;

}
function getCidades() {

  sEstado = document.getElementById("listacursos").value;
  ajax = ajaxInit();
  
  if (ajax) {
     ajax.open("GET", "combocidades.php?cod_curso=" + sEstado, true);	 
     ajax.onreadystatechange = function (){
        if (ajax.readyState == 4){
           if (ajax.status == 200){
              document.getElementById('listas_de_cursos').innerHTML = ajax.responseText;
           } else {
              alert(ajax.statusText);
           }
        }
     }
     ajax.send(null);
  }
  
}
/*----------------------------------------------------------------*/