Coding Help

Hi All, I have written my first script with some help from examples on this forum, the script fires via a workflow button and generates a Sales Order.

This all works fine but I need to capture the tranid to link onto a field in a custom record, the button sits originally on that custom record.

my code is below, can anyone suggest how I go about catching the Sales Order tranid field in order to populate it back into the field.

function CreateSO()    {  var newRec = nlapiGetNewRecord();  var customer = newRec.getFieldValue('custrecord_sb_customer'); //Capture location    var record = nlapiCreateRecord('salesorder');     record.setFieldValue('entity', customer);     record.setFieldValue('otherrefnum', 01);     record.setLineItemValue('item','item',1,3811)          var id = nlapiSubmitRecord(record, true);  }