Connecting to leopard 10.5 networked iMac

Hi,
I've just put in a wireless router and setup a home network. I have an iMac running Leopard (up to date leopard as of 9th Nov 2008) and I have a Macbook Pro running 10.4.11. The iMac is connected wirelessly to the network and can get internet access. The same for the Macbook Pro.
However, they are unable to see each other wirelessly. I can see the network when I connect the Macbook Pro to the router via ethernet cable. But when I go wireless, I cannot see the network or it's shared printer.
I tried opening ports on the router. But no cigar. And I have enabled shared printer access for the iMac.
Any thoughts? Thanks in advance.

Hi Rodney,
Yes, I have disabled both firewalls on both Macs (tiger and leopard). It's funny, because when I boot up in Windows, I can see the Leopard machine. And when I boot up in Tiger and connect via ethernet, I can see the machine. It's just an issue with the wireless connection and I'm out of options!
Thanks!

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