// JavaScript Document
function list_dados( valor ){
	http.open("GET", "result.php?id=" + valor, true);	
	http.onreadystatechange = handleHttpResponse;
	http.send(null);
}

function handleHttpResponse(){
  	campo_select = document.forms[0].subcategoria;
  	
	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.