Troubles with my "return" value

I'm attempting to do a very simple script to validate two fields prior to saving a customer/lead/prospect record. But when I put the code into the debugger, I end up receiving "unexpected error" invalid return. See below for code block.

 {   var status = 14;   var reason = nlapiGetFieldValue('custentity_reason_closed_field');   var dept = nlapiGetDepartment();   var primaryReason = nlapiGetFieldValue('custentity_primary_nr_reason');   var primaryReasonDetails = nlapiGetFieldValue('custentity_primary_nr_reason_det');      //status 14 is closed, and 29 is not renewed      if ((status == '14' || status == '29') && (reason == null || reason == ''))    {          if (dept == 8 || dept == 10)    {     alert("Please enter a Reason Code for closing this record");                return false; //offending return statement    }                  }      return true;  }