function ajaxFunction(special)
{
var xmlHttp;
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!\n To place an order Phone 0800 612 9577 or email us: sales@wallfillers.com");
      return false;
      }
    }
  }
  xmlHttp.onreadystatechange=function()
    {
    if(xmlHttp.readyState==4)
      {
      	serial=xmlHttp.responseText;
      //alert("ajax.js line 34: serial = " + serial);
	  
	  if (special=="S") {
	  //alert("ajax.js Line 37: Special item");
	  	document.getElementById("specialref").innerHTML="S"+serial; 	// put the serial number here. Not shown to customer, but used for cart
} else {
	document.getElementById("postref").innerHTML="P"+serial; 	// put the serial number in place to display when someone choosed post photo method
	document.getElementById("emailref").innerHTML="E"+serial; 	// put the serial number in place to display when someone choosed email photo method    
	}
      }
    }
	//alert("ajax.js: about to get serial number with xmlHttp.open");
  xmlHttp.open("GET","http://www.wallfillers.com/serial.php?bare=YES",true);
  xmlHttp.send(null);
  }