Query on exception handling in PL/pgSQL

Hi,

I am just a beginner in postgreSQL and writing some
functions in PL/pgSQL. I use the libpq interface in
the client to call this funtions. My pgsql function
does an insert to a table and I have opened a
transaction block before calling my function from the
client. When the insert operation fails due to unique
key violation the whole transaction aborts. Is there a
way I can handle this error in my pgsql funtion rather
that aborting and not executing the rest of the
operations?. I have a workaround , But I was wondering
if there is an inexpensive way of doing it.

Another query I have is related to returning values
from funtions. How can I return multiple values from a
function? Is there any support for OUT variable in
pgsql functions?
Any pointers on this is greatly appreciated.

Thanks
Diya.

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