Extending a wired LAN with Airport Express & Sharing Printer

Hello.
I currently have a wired network consisting of two G5s behind a router, which is connected to the internet via an ADSL modem. Neither of the G5s have airport cards.
I want to extend the network wirelessly for two iBooks to share the existing ADSL connection. Can I do this simply by plugging an Airport Express into one of the free LAN ports on my existing router? Wouldn't this cause problems with DHCP and any port forwarding I have set up on the router?
I also have a USB printer (HP LaserJet 1300) which is currently connected to one of the G5s because the router doesn't have a printer port. After extending my network wirelessly as described above, if I plugged the printer into the USB port on the Airport Express would the two G5s be able to print to it? Would I have to use IP printing?
Thanks in advance for any advice.
Dual G5 1.8GHz Mac OS X (10.4.4)

Can this be done?
Yes, if you have an AirPort Expess 802.11"n" and you configure it to "Join a wireless network", then you can select the option to "Enable Ethernet Clients", which will activate the Ethernet port.
The Express"n" can join virtually any wireless network if you know the exact type of wireless security that the main router is using.
If you are not sure which model of Express you have, look on the side of the device in the faint print for the Model No. You need to see A1264 there.
"this network cannot be extended".
The Express can only "extend a wireless network" if the main network is provided by an Apple "n" wireless router. Do you have an Apple router or another brand?

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Hi,
I have been trying to extend my existing wireless network recently but it never ended up how I wished...
I have one 4th generation Time Capsule (A1409) and two Airport Express 802.11n (1st generation A1264).
All currently have MAC Address base authentication and no security in place for was of testing (security not relevant at this point in time).
When I extend my Time Capsule with either Airport Express this works like a charm, the LEDs are all green and connection works for client devices.
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However what I have found not to works it extending my Time Capsule with one Airport Express and then extending this Airport Express with the second Airport Express.
Apple's "extend a wireless network" feature will only allow you to extend the signal one level, not two. It's possible to have more than one device extending the signal, but each extender must connect directly to the main base station.....not to another device that is already extending the signal.
The Airport Utility would even accurately depict the situation with Airport Express one dotted line to Time Capsule, and Airport Express two dotted line to Airport Express one.
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http://support.apple.com/kb/HT4259?viewlocale=en_US&locale=en_US
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Extending a wired LAN with Airport Express & Sharing Printer

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