I would keep your current junction structure (many to many), and then add the display element to forms and reports when needed, and not concatenate the department in the main table. I would also do this:
empDepts:
-----------
empDeptsID - PK
empID - FK
deptID - FK
I can show you how to display the departments for an employee using regular expressions and an extra text box. I do this sort of thing now and then on forms and especially in reports.
mmcdonal
Look it up at:
http://wrox.books24x7.com