//-- ***************** SCRIPT PARA IMPLEMENTAR O AJAX *************************-->
function criaXMLHttp() {
if (typeof XMLHttpRequest != "undefined")
return new XMLHttpRequest();
else if (window.ActiveXObject){
var versoes = ["MSXML2.XMLHttp.5.0",
"MSXML2.XMLHttp.4.0", "MSXML2.XMLHttp.3.0",
"MSXML2.XMLHttp", "Microsoft.XMLHttp"
];
}
for (var i = 0; i < versoes.length; i++){
try{
return new ActiveXObject(versoes[i]);
}catch (e) {}
}
throw new Error("Seu browser nao suporta AJAX");
}

function BuscaId($valor){
var id = document.getElementById("id");
var divInfo = document.getElementById("pagina");
var XMLHttp = criaXMLHttp();
switch ($valor)
{
    case 1:
    XMLHttp.open("get", "empresa.php", true);
    break;
    case 2:
    XMLHttp.open("get", "produtos.php", true);
    break;
    case 3:
    XMLHttp.open("get", "contato.php", true);
    break;
}
XMLHttp.setRequestHeader("Content-Type", "application/x-www-form-urlencoded; charset=UTF-8");
XMLHttp.onreadystatechange = function () {
if (XMLHttp.readyState == 4)
if (XMLHttp.status == 200){
divInfo.innerHTML = XMLHttp.responseText;


} else {
divInfo.innerHTML = "Um erro ocorreu" + XMLHttp.statusText;
}
};
XMLHttp.send(null);
}

function Produto($tipo) {
  var divInfo = document.getElementById("produtos");
  var XMLHttp = criaXMLHttp();
  // código para carregar a linha de produtos
  //XMLHttp.setRequestHeader("Content-Type", "application/x-www-form-urlencoded; charset=UTF-8");
  XMLHttp.open('GET', 'busca_produtos.php?tipo='+$tipo, true);
  XMLHttp.onreadystatechange = function () {
  if (XMLHttp.readyState == 4)
     if (XMLHttp.status == 200){
        divInfo.innerHTML = XMLHttp.responseText;
     }
     else{
     divInfo.innerHTML = "Um erro ocorreu: " + XMLHttp.statusText;
        }
     }
     XMLHttp.send(null);
  }