How to keep connection alive?

I wondering if there is any way to keep connection alive during some period of inactivity.
I have the SQL Developer 1.2.1 (it is not easy to update as I have no admin privileges on work computer) under Windows XP, connecting to Oracle9i Enterprise Edition Release 9.2.0.6.0.
The inconvenience is that the connection become dropped after some inactivity time.
What I have to do is to disconnect and connect again. But if I run any query in dropped connection condition it would take long time before it come back with a message that there is no connection.
I could not find any kind of 'stay connected' option. (Like it is in some other application with time set possibility to send a some request to a server just to stay connected (for exm: PuTTY))
To do it by myself it would be done by having some continuously looping script, that would run some simple select (say, sysdate) periodically, but I do not know if it possible to do it from SQL Developer.
If it done in PL-SQL, it will be processed in Oracle, not in SQL Developer; so, it is not useful.
Does anybody have or know any suggestion or advice to keep connection stay active?
Appreciate any help!
Alex
Message was edited by:
alex5161

The trouble is shared connections. While the dbms_lock.sleep is sleeping, the connection will be frozen.
Having said that, the real solution is to fix how sqldeveloper handles lost connections. Session timeouts are usually there for a reason and client software needs to learn to live with it.

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