Allright, now we need to set up your relationships,
First, open your db, and select tools|relationships, and add all your tables. Add the staff table twice.
Here's your relationships,
You want to drag the bold field 'StaffID' in 'tblstaff' to 'StaffID' on the table 'TblHours'. Check enforce referential integrity and cascading updates.
Drag 'DepartmentID' from 'TblDepartment' to 'DepartmentID' on 'TblStaff'.
Check enforce referential integrity and cascading updates.
Drag 'HourTypeID' on 'TblHourType' to 'HourTypeID' on 'TblHours'.
Check enforce referential integrity and cascading updates.
Drag 'PayRateID' from 'TblPayRate' to 'PayRateID' on 'TblStaff'.
Check enforce referential integrity and cascading updates.
Drag 'StaffID' from the second 'TblStaff' to 'DepartmentHeadID' in 'TblDepartment'.
Check enforce referential integrity and cascading updates.
I am assuming that pay rate is determined by position. If this is not the case, you don't need a payrate table, just a field in 'TblStaff' to put each employees base pay rate.
Your relationships should look something like this:
http://www.theillumni.com/posts/images/staffrel.gif
HTH,