One Mac logs in, One doesn't

I have a new Dlink wireless network. I had everything working fine, and then went on a business trip with my mac. Now I can't wirelessly connect to my network. My other machine does perfectly, and I can use a cable, but when I enter the password to join my network it times out or says I have entered an incorrect password. I want to double check the password on my other machine, but I can't find it displayed. That machine is running 10.4 Mine is 10.5. Any advice short of resetting the router and starting over would be great, especially anything about finding the password on the other machine. Thanks in advance

delete the network and then create a new one with a new password

To find the password, access your network settings and were it displays all the information check the box that says "Show Password".

This means that instead of displaying the password like *** it will be displayed as 123.

I did find the password on the home machine, and it is not working on the travel machine. All settings are the same. I was hoping to avoid deleting the network, which involves resetting the router, because of my printer and NAS device, but I guess I will have to.