var xmlhttp;
var idNum;
function addTrack(str, phppage){
  xmlhttp=GetXmlHttpObject();
  if (xmlhttp==null)    {
    alert ("Browser does not support HTTP Request");
    return;
  }

  var url= phppage; 
  url=url+"?q="+str;
  idNum = str;
  xmlhttp.onreadystatechange=stateChanged;
  xmlhttp.open("GET",url,true);
  xmlhttp.send(null);
}

function stateChanged(){
  if (xmlhttp.readyState==4)  {
    document.getElementById("txtHint" + idNum).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;
}