Table: Data Type (Lookup)

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I came upon an idea, and wonder about it's feasability (sp?).

If I create a table...(let's say: tblEmployee)
I create a field in that table...(lets say: emPosition)
And I set that field's data-type to Lookup...
And I enter in 20 different entries as a Value List...

What if I want the users to enlarge the emPosition field...?

In other words...
What if next year we hire on 3 Elephant Trainers...
I want the user to enter 'Elephant Trainer' in the emPosition field...
THEN, I want the entry 'Elephant Trainer' to pop-up in that Value List...

How do I do this...?
If I create a form for entering new Employees...
How can I cause a NEW entry in the emPosition field to add to the list...?

Is there code? A shortcut...?
I DON'T want users to have access to my tables to go in and manually add it...I want to add it from the User Form...

How? How? How?

Thanks in advance