function ajax() {

  var xmlhttp, bComplete = false;
  try { xmlhttp = new ActiveXObject("Msxml2.XMLHTTP"); }
  catch (e) { try { xmlhttp = new ActiveXObject("Microsoft.XMLHTTP"); }
  catch (e) { try { xmlhttp = new XMLHttpRequest(); }
  catch (e) { xmlhttp = false; }}}
  if (!xmlhttp) return null;
  this.connect = function(sURL, sMethod, sVars, fnDone)
  {
    if (!xmlhttp) return false;
    bComplete = false;
    sMethod = sMethod.toUpperCase();

    try {
      if (sMethod == "GET")
      {
        xmlhttp.open(sMethod, sURL+"?"+sVars, true);
        sVars = "";
      }
      else
      {
        xmlhttp.open(sMethod, sURL, true);
        xmlhttp.setRequestHeader("Method", "POST "+sURL+" HTTP/1.1");
        xmlhttp.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
		xmlhttp.setRequestHeader("Content-length", sVars.length);
		xmlhttp.setRequestHeader("Connection", "close");
      }
      xmlhttp.onreadystatechange = function(){
        if (xmlhttp.readyState == 4 && !bComplete)
        {
          bComplete = true;
          fnDone(xmlhttp);
        }
      };
      xmlhttp.send(sVars);
    }
    catch(z) { return false; }
    return true;
  };
  return this;
}

var objeto = function(objetoXML) {
  document.getElementById('conteudo').innerHTML = objetoXML.responseText;
};

function carrega_get(url) {
  document.getElementById('conteudo').innerHTML = loader;
  conexao.connect("include_get.php", "GET", "pagina="+url, objeto);
};

function carrega_post(url, parametros) {
  document.getElementById('conteudo').innerHTML = loader;
  conexao.connect("include_post.php", "POST", "pagina="+url+"&"+parametros, objeto);
};

function executa_contato(form) {
  x = form;
  var verifica = valida();

  if(verifica != false) {
    get(x.parentNode, 'envia');
  }
  else {
    return false;
  }
}

function get(obj, destino) {
  var getstr = "";
  for (i=0; i<obj.getElementsByTagName("input").length; i++) {
        if (obj.getElementsByTagName("input")[i].type == "text") {
           getstr += obj.getElementsByTagName("input")[i].name + "=" + 
                   escape(obj.getElementsByTagName("input")[i].value) + "&";
        }
        if (obj.getElementsByTagName("input")[i].type == "checkbox") {
           if (obj.getElementsByTagName("input")[i].checked) {
              getstr += obj.getElementsByTagName("input")[i].name + "=" + 
                   escape(obj.getElementsByTagName("input")[i].value) + "&";
           } else {
              getstr += obj.getElementsByTagName("input")[i].name + "=&";
           }
        }
        if (obj.getElementsByTagName("input")[i].type == "radio") {
           if (obj.getElementsByTagName("input")[i].checked) {
              getstr += obj.getElementsByTagName("input")[i].name + "=" + 
                   escape(obj.getElementsByTagName("input")[i].value) + "&";
           }
     }  
     if (obj.getElementsByTagName("input")[i].tagName == "SELECT") {
        var sel = obj.getElementsByTagName("input")[i];
        getstr += sel.name + "=" + escape(sel.options[sel.selectedIndex].value) + "&";
     }
  }
  for (i=0; i<obj.getElementsByTagName("textarea").length; i++) {
    getstr += obj.getElementsByTagName("textarea")[i].name + "=" + 
      escape(obj.getElementsByTagName("textarea")[i].value) + "&";
  }

  carrega_post(destino, getstr);
}