Automatic notification in JSP

Hi I am working with tomcat.

Mine is an intranet application. In my application if some one puts some query for otheruser i save this to database.

Now whenever the second user logs in if some querrires are put for him i can show that but my concern is if that user is already online and during that time if some message comes for him i want to show him notification that some one has posted message for you.

This is same as in MSN messanger or yahoo messagner when some logs in ...messanger shows u message ....like this way i want to do.

If any of you have some idea please let me know for that in detail.

Thanks

Taral Shah

(tarals@contechsoftware.com)

[709 byte] By [taral_shah] at [2007-9-26 3:35:43]