var xmlHttp;

function updateOption(str, server)
 { 
 xmlHttp=GetXmlHttpObject();
 if (xmlHttp==null)
  {
//  alert ("Browser does not support HTTP Request");
  return;
  } 

 var url= server + "/getoptions.php";
 url=url+"?optionid="+str;
 url=url+"&qty="+document.getElementById("quantity").value;
 url=url+"&pid="+document.getElementById("product_id").value; // lookup price for qty discount only
// url=url+"&sid="+Math.random();
// alert(url);

 xmlHttp.onreadystatechange=stateChanged;
 xmlHttp.open("GET",url,true);
 xmlHttp.send(null);
 }

function stateChanged() 
	{ 
	if (xmlHttp.readyState==4 || xmlHttp.readyState=="complete")
		{
		 xmlDoc=xmlHttp.responseXML;
//		alert("test: " + xmlDoc.getElementsbyTagName("optionprice")[0].childNodes[0].nodeValue);
		document.getElementById("displayprice").innerHTML = xmlDoc.getElementsByTagName("optionprice")[0].childNodes[0].nodeValue;

		 }
	} 

function GetXmlHttpObject()
 { 
 var objXMLHttp=null;
 if (window.XMLHttpRequest)
  {
  objXMLHttp=new XMLHttpRequest();
  }
 else if (window.ActiveXObject)
  {
  objXMLHttp=new ActiveXObject("Microsoft.XMLHTTP");
  }
 return objXMLHttp;
 }