I have a white MacBook running OSX 10.5.6, and I have trouble connecting to wireless networks that require you to login. Example: I'm in my school's library, I open up my macbook, connect to the wireless network, open up firefox, attempt to go to a web page, and get a message that says that I am offline instead of being directed to the wireless log-in page. This happens at every wireless location that requires you to login/buy a pass to access the internet. The only work around that I've found is to reboot my computer. I think the issue involves my computer retrieving the wireless network's DNS address. Is there a way I can force my computer to pull down the DNS address? I've tried manually entering the school's DNS IPs, but it doesn't seem to work all the time. Any help would be appreciated.