// Seleciona Categorias

function list_dados( valor )
   {
     http.open("GET", "telas/resultado.php?id=" + valor, true);
     http.onreadystatechange = handleHttpResponse;
     http.send(null);
   }
   function handleHttpResponse()
   {
   campo_select = document.forms[0].id_bairro;
     if (http.readyState == 4) {
     campo_select.options.length = 0;
      results = http.responseText.split(",");
      for( i = 0; i < results.length; i++ )
      {
      string = results[i].split( "|" );
      campo_select.options[i] = new Option( string[0], string[1] );
     }
    }
   }
   function getHTTPObject() {
   var req;
     try {
      if (window.XMLHttpRequest) {
        req = new XMLHttpRequest();
      if (req.readyState == null) {
        req.readyState = 1;
        req.addEventListener("load", function () {
        req.readyState = 4;
      if (typeof req.onReadyStateChange == "function")
        req.onReadyStateChange();
     }, false);
   }
  return req;
  }
     if (window.ActiveXObject) {
       var prefixes = ["MSXML2", "Microsoft", "MSXML", "MSXML3"];
     for (var i = 0; i < prefixes.length; i++) {
       try {
        req = new ActiveXObject(prefixes[i] + ".XmlHttp");
        return req;
      } catch (ex) {};
    }
  }
  } catch (ex) {}
   alert("XmlHttp Objects not supported by client browser");
  }
  var http = getHTTPObject();
   // Logo após fazer a verificação, é chamada a função e passada
   // o valor à variável global http