var xmlhttp;

function CheckCode(str) {
  //if(str.length == 8)  {

    document.getElementById("txtHint").innerHTML="<img src='/images_shop/loading.gif'>";

    xmlhttp=GetXmlHttpObject();
    if (xmlhttp==null) {
      alert ("Browser does not support HTTP Request");
      return;
    }
    var url="addiscountgetcode.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;
}