If jms can destroy unsent message when new message comes?

I'm new to JMS and have a question about the pub/sub model. Hope experts can give some instructions.
My application has multi-publisher and multi-subscriber of a topic. Since the subscriber sometimes is slow, one message may not have been processed before another message is published. I wonder if the JMS will queue the new message up and send out later when possible. If that is the case, there may be more than one messages piled in JMS. Because the subscriber in my application only interests in the most recent message, is there a way to config JMS to destroy the unsent messages when any new message arrives?
Thanks!
Joey

this would be an extension. definitely not part of the specification.
_sjz.

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