SQL 2005 Parameterized Views ?????

I'm just looking at trying to create a view in SQL 2005 that pulls back data based upon a value.... i.e. :

SELECT     request_item AS [Item Reference], request_by AS [Requested By], requested_on AS [When Requested]
FROM         dbo.PCT_Active_Requests
where request_to = @in_site
---------------------------------------------------------------------------------------------------------------------------------------

Now, I know I can't use parameters in a View, so I'm guessing I need a function. Basically, the 'SITE' argument is calculated on what the user logs into windows as. Again, this is no problem when calling a stored procedure from a .net front end as the system.environment.username is able to be passed as a parameter.

What I'm looking to do, I think....., is to be able to create a view which has a function as the argument for the WHERE statement, but the function needs to be able to know what the user is logged into windows as....we're not planning on using INTEGRATED SECURITY, but if we have to, then we have to....

I hope this makes some sort of sense?

Thanks,

JC