function list_dados( valor )
{
  if (valor == null) {
  	valor = 0;
  }
  http.open("GET", "../js/result_cbo.php?id=" + valor, true);
  http.onreadystatechange = handleHttpResponse;
  http.send(null);
}

function handleHttpResponse() {
	destination = 0;
	campo_select = document.forms[0].destination;
	if (http.readyState == 4) {
	campo_select.options.length = 0;
	results = http.responseText.split(",");
	campo_select.options[0] = new Option( "Select Destination", "0" );
	for( i = 0; i < results.length - 1; i++ ) { 
		string = results[i].split( "|" );
		campo_select.options[i+1] = new Option( string[0], string[1] );
		if (string[1] == destination) { 
			campo_select.options[i+1].selected = true;
		} 
	}
}

}
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.



	function ValidarCampos() {
		if (document.form_rates.departure.value == '0') 
		  {
			alert('Please, select a departure');
			document.form_rates.departure.focus();
			return false;
		  }
		if (document.form_rates.destination.value == '0') 
		  {
			alert('Please, select a destination');
			document.form_rates.destination.focus();
			return false;
		  }
		if (document.form_rates.carros.value == '0') 
		  {
			alert('Please, select a car');
			document.form_rates.carros.focus();
			return false;
		  }
	}