Does anyone know of a script or program to buy that does the following:

When the user logs in the time and date are either e-mailed to the administrator or sent to a log file that only the administrator can access. When the user logs out the same thing happens.

If possible, this script can only be used on the one computer that will be in the office of my client - it's to check the hours the staff are working - a bit like an online clock in and out system.