Set FieldValue on Specific Criteria

Hi,

I hope sombody can help me with this small script as I am stuck and still in the learning process of creating scripts with Java
This User Event Script is Deployed to the Item records and needs to be triggered beforeSubmit

The // indicates the line where I want to define the criteria that the custitem_prodgrp needs to be equal to internal ID 9

 function beforeSubmit(type,form,request)    {      if (type == 'edit' || type == 'create')      {          var newRecord = nlapiGetNewRecord();          newRecord.setFieldValue('includechildren','T');          newRecord.setFieldValue('taxschedule',2);              }        /*           // if('custitem_prodgrp') ='9');       {          newRecord.setFieldValue('subsidiary',6);       }          }