// JavaScript Document
var browser = null;

function createRequest()
{
  var request = null;
  try
  {
    request = new XMLHttpRequest();
	  browser = "other";
  }
  catch (trymicrosoft)
  {
    try
	{
      request = new ActiveXObject("Msxml2.XMLHTTP");
	  browser = "ie";
    }
	catch (othermicrosoft)
	{
      try
	  {
        request = new ActiveXObject("Microsoft.XMLHTTP");
	  browser = "ie";
      }
	  catch (failed)
	  {
        request = null;
      }
    }
  }

  if (request == null) {
    alert("Erro ao criar o objeto Ajax!");
  } else {
    return request;
  }
}

var requestCursosExtra = createRequest();

function replaceText(el, text)
{
  if (el != null)
  {
    clearText(el);
    var newNode = document.createTextNode(text);
    el.appendChild(newNode);
  }
}

function clearText(el)
{
  if (el != null)
  {
    if (el.childNodes)
	{
      for (var i = 0; i < el.childNodes.length; i++)
	  {
        var childNode = el.childNodes[i];
        el.removeChild(childNode);
      }
    }
  }
}

function getText(el)
{
  var text = "";
  if (el != null)
  {
    if (el.childNodes)
	{
      for (var i = 0; i < el.childNodes.length; i++)
	  {
        var childNode = el.childNodes[i];
        if (childNode.nodeValue != null)
		{
          text = text + childNode.nodeValue;
        }
      }
    }
  }
  return text;
}

function getCursosExtra(curso)
{
	var url = "resultado.php?curso=" + escape(curso);
	requestCursosExtra.open("GET", url, true);
	requestCursosExtra.onreadystatechange = updateCursosExtra;
	requestCursosExtra.send(null);
}

function updateCursosExtra()
{
	if (requestCursosExtra.readyState == 4)
	{
		if (requestCursosExtra.status == 200)
		{
			var CursosExtraContent = requestCursosExtra.responseText;
			var CursosExtraDiv = document.getElementById("resultado");
			CursosExtraDiv.innerHTML = CursosExtraContent;
		}
		else
			alert("Erro! Status de request: " + requestCursosExtra.status);
	}
}