Comparing Custom Password field to an Employees password

When capturing a Cash Sale, if an employee enters a discount above a certain percentage, we went the supervisor to approve this Cash Sale by keying in their  password. So on the Cash Sale form I want to compare a custom password field with the Supervisors NetSuite password. Is this possible or will I have to create my own password custom field on the employee record.

This is a portion of the code that I have but it always says that the password doesn't match.

 var supervisor = nlapiGetFieldValue('custbody_employee_supervisor');  var supervisorRec = nlapiLoadRecord ('employee', supervisor);  if (nlapiEncrypt(nlapiGetFieldValue('custbody_supervisor_password')) == supervisorRec.getFieldValue('password')) {   alert ('password does match');  } else {   alert ('password does NOT match');  }