Porting from MSSQL Server

I am porting a database from M$SQL Server to PostgreSQL.

I have a problem with a query. On MS SQL Server it looks like this:

DECLARE @handle AS NVARCHAR(40)
EXEC @handle = IPAddressToHandle 'x.x.x.x'
SELECT * FROM tblEmployee WHERE tblEmployee.handle = @handle UNION SELECT
...

I have created the function  IPAddressToHandle which works, but how do I
declare the variable handle, execute the function and then the query with
the variable as parameter.

Btw.: I cannot resolve the ip address to the handle with INNER JOINS in the
query since the query is VERY long with many UNION SELECT statements.

/Hans

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