var xmlhttp;

function showUser(str)
{
xmlhttp=GetXmlHttpObject();
document.getElementById("txtHint").innerHTML = '<img src="http://tiemnangviet.com/next/ajax-loader.gif">';

if (xmlhttp==null)
  {
  alert ("Browser does not support HTTP Request");
  return;
  }
var url="http://tiemnangviet.com/next/php.php";
url=url+"?q="+str;
url=url+"&sid="+Math.random();
xmlhttp.onreadystatechange=stateChanged;
xmlhttp.open("GET",url,true);
xmlhttp.send(null);
}

function stateChanged()
{
if (xmlhttp.readyState==4)
{
document.getElementById("txtHint").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;
}
function close_default(){
    document.getElementById('default').style.display = "none"
}