var xmlHttp;

function onReadyStateChange( as_url, as_idField, ai_codigoAcao ){ 
   var ls_erro = 'N';
   var ls_valor = document.getElementById(as_idField).value;

   xmlHttp = GetXmlHttpObject();

   if(xmlHttp==null){
      alert ("Prezado usuário, houve um erro durante a execução desta ação. Erro 01.");
      return false;
   }

   xmlHttp.open("GET",as_url,true);

   xmlHttp.onreadystatechange=function(){
      if(xmlHttp.readyState == 1){
         document.getElementById(as_idField).value = "Aguarde...";
      }

      if(xmlHttp.readyState==4){
         document.forms[0].hf_returnajax.value=xmlHttp.responseText;
         document.getElementById(as_idField).value = ls_valor;
         returnAjax(ai_codigoAcao);
	  }
   }

   xmlHttp.send(null);

   return true;
}

function GetXmlHttpObject()
{
var xmlHttp=null;
try
 {
 // Firefox, Opera 8.0+, Safari
 xmlHttp=new XMLHttpRequest();
 }
catch (e)
 {
 // Internet Explorer
 try
  {
  xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
  }
 catch (e)
  {
  xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
  }
 }
return xmlHttp;
}