How to determine which are "idle in transaction"

When I do a "ps ax" I have 7 processes originating from my application
that are permamently "idle in transaction".   First off, is this
something to be concerned about?  It appears to be a vendor library
that's causing it.  Second, how can I tell what these stuck transactions
are?  Is there a way to list them?
(I'm using postgresql  7.1.3)

Thanks,

-Mike

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Mike Bridge