create databases with plpgsql

a novice has the following challenge (problem):

I would like to create a certain number of new databases named stud01, 
stud02...to stud25 with a plpgsql-script. But I have difficulties to 
create a new database with a script. I saw a lot of different scripts in 
the manuals to create tables, but no new db.

Generally, is it possible at all? Do you may have any suggestions, 
workarounds, ideas?

any help will be appreciated...

I tried the these simple script without any loop, unfortunately without 
success:

create or replace function createDB(text) returns text as '
DECLARE   DBname ALIAS FOR $1;   sqlquery text;   result text;
BEGIN   sqlquery := ''CREATE DATABASE %'', DBname;   EXECUTE( sqlquery );   RETURN DBname
END;
' language 'plpgsql';

Thank you for your help

sirius