How do you update a linksys router firmware without the configuration screen?

I have a linksys wrt54gs v.5 wireless router and when I try to configure it the configuration screen comes up with no links or text input box labels. Is there any way to reset the firmware without the configuration screen?|||if the problem is you dont have the password, you will have to reset the device. Check there website, its fairly simple to do and will reset all the settings back to the defaults including the password