javascript issue please help

[mjpwall]

Hi,

Very new here but if anyone can help I'd be very very grateful.

I need to output the order total and customer or order id to the following javascript that sends this info to a referer as part of a points reward system operated by a third party the code is:

<Script Language="JavaScript">
<!--//Begin
var winName = top.window.name;
var winNameArray = winName.split("_");
var MemberID = winNameArray[1];
var OfferID = winNameArray[2];

var transaction_value = 'WRITE_OUT_VALUE_OF_TRANSACTION_HERE';
var unique_identifier = 'WRITE_OUT_UNIQUE_IDENTIFIER_HERE';

if (top.window.name.substring(0,17)=="PigsBackMemberID_") {
document.write('<img src="https://www.pigsback.com/pb/callback.asp?mid='+MemberID+'&oid='+OfferID+'&desc='+transaction_value+'&uid='+unique_identifier+'" width="1" height="1">'); }
//-->
</Script>

anyidea how to do this?