var xmlhttp;

function showModelos(str){
  $.get("ajaxComboPopulate.php", {q:str, sid:Math.random() }, function(data){
    //alert("Data Loaded: " + data);
    $("#txModelo").html(data);
  });

}

function stateChanged()
{
if (xmlhttp.readyState==4)
{
document.getElementById("txModelo").innerHTML=xmlhttp.responseText;
}
}

function GetXmlHttpObject()
{
if (window.XMLHttpRequest)
  {
  // code for IE7+, Firefox, Chrome, Opera, Safari
  return new XMLHttpRequest();
  }
if (window.ActiveXObject)
  {
  // code for IE6, IE5
  return new ActiveXObject("Microsoft.XMLHTTP");
  }
return null;
}