var xmlHttp

function showHint(str){
  if(str.length == 0){
    document.getElementById("txtHint").innerHTML = "";
    return
  }

  xmlHttp = GetXmlHttpObject()
  if(xmlHttp == null){
    alert ("Browser does not support HTTP Request")
    return
  }

  var url = "cep.php?q=" + str + "&sid=" + Math.random()
  xmlHttp.onreadystatechange = stateChanged
  xmlHttp.open("GET",url,true)
  xmlHttp.send(null)
}

function stateChanged(){
  if(xmlHttp.readyState == 4 || xmlHttp.readyState == "complete"){
    document.getElementById("txtHint").innerHTML = xmlHttp.responseText
  }else{
	document.getElementById("txtHint").innerHTML = "Aguarde..."
  }
}

function GetXmlHttpObject(){
  var objXMLHttp = null;
  if(window.XMLHttpRequest){
    objXMLHttp = new XMLHttpRequest()
  } else if(window.ActiveXObject){
    objXMLHttp = new ActiveXObject("Microsoft.XMLHTTP")
  }
  return objXMLHttp;
}