Proper syntax of WHERE (select...)?

I am attempting to generate a random select from a database. Here's
basically what I'm trying to do:

1. select the qualified segments from a databaes
(the query is...
where moderator>'' and leadin>'')

2. from this selection, select 3 random segments.

I had thought that

select id,name,leadin from country where
oidrand(oid,3) in (select id,name,leadin from country where moderator>''
and leadin>'');

would work, but it definitely doesn't. I've been hacking around on this for
a while and can't seem to find a solution. I can get the system to select a
random number from the database, but not a random number of qualified
results.

Any suggestions from anyone?

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