Just a quick follow up....
I added the xml below and it worked perfectly.
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<!DOCTYPE sun-ejb-jar PUBLIC "-//Sun Microsystems, Inc.//DTD Application Server 9.1.1 EJB 3.0//EN" "
http://www.sun.com/software/appserver/dtds/sun-ejb-jar_3_0-1.dtd">
<sun-ejb-jar>
<enterprise-beans>
<unique-id>0</unique-id>
<ejb>
<ejb-name>OurMDBBean</ejb-name>
<jndi-name>jms/ourQueue</jndi-name>
<bean-pool>
<steady-pool-size>0</steady-pool-size>
<resize-quantity>1</resize-quantity>
<max-pool-size>5</max-pool-size>
<pool-idle-timeout-in-seconds>300</pool-idle-timeout-in-seconds>
</bean-pool>
</ejb>
</enterprise-beans>
</sun-ejb-jar>
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