How To Use A Parameter In Place Of A Literal?

I have a stored procedure that starts like this:

.
.
.
UPDATE Employees
set depth=0, hierarchy=NULL

UPDATE Employees
set depth=1, hierarchy=right(@MaxPadLength + CAST(Employees.Parent AS varchar(255)),@DisplayPadLength)
where Child = Parent

WHILE EXISTS
(
SELECT *
FROM Employees
WHERE Depth=0
)
.
.
.
I have many tables that have the same structure as the Employees table but have different names. I would like to pass the PS a paramater with the table name I want to process. My question is what is the correct syntax to use a parameter in place of the literals for the table name?

Thanks