// JavaScript Document
function AppyPromoCode(subtotal) {
var xmlHttp;
var promocode = document.getElementById('disc-ot_coupon').value;
try
  {
  // Firefox, Opera 8.0+, Safari
  xmlHttp=new XMLHttpRequest();
  }
catch (e)
  {
  // Internet Explorer
  try
    {
    xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
    }
  catch (e)
    {
    try
      {
      xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
      }
    catch (e)
      {
      alert("Your browser does not support AJAX!");
      return false;
      }
    }
  }
  xmlHttp.onreadystatechange=function()
    {
    if(xmlHttp.readyState==4)
      {
      	document.getElementById('display_promo').innerHTML=xmlHttp.responseText;
      }
    }
  xmlHttp.open("GET","calculatepromo.php?subtotal="+subtotal+"&promocode="+promocode,true);
  xmlHttp.send(null);
}