calling EXECUTE on any exception

Hi all: I want to call some FUNCTION , let say
exception_hanler(Exception_code) for any exception in plsql functions. I
give some pseudo code to explain myself better:

CREATE FUNCION something(...) returns ...
AS
'
...

EXCEPTION WHEN OTHER THEN   EXECUTE exception_handler(Exception_code)
...
'

and let exception_handler() function make all the work and returns some
value for mi program...Now, the actual question...how do i get that
error_code (or code_name, whatever i can get) generated in the something()
function to be proccesed by the exception_handler() function?

Im talking of 8.0 plsql language by the way.

Thanks in advance!
-- 
Gerardo Herzig
Direccion General de Organizacion y Sistemas
Facultad de Medicina

U.B.A.