IMac wireless connection probem

Hi there!
I can connect to my router via wireless connection, but I cannot open any webpage.
Anyone has an idea what the problem might be?
Thanks!
Qiao

Mac OS X (10.4)
Use Software Update to update your OS to last version of Tiger.  Install all the other updates that goes along w/it.
Change your router channel number.  Most times this works & is all you have to do.
System Preferences>Network
Click the Assist Me button.
In the next window that pops up, click the Diagnostic button & do the necessary.
See KB Articles:  http://support.apple.com/kb/HT1401 AirPort troubleshooting guide
http://support.apple.com/kb/HT2712 Using network locations in Mac OS X
Manually provided DNS server addresses are higher priority than DHCP's
http://support.apple.com/kb/HT1714 Solutions for connecting to the Internet, setting up a small network, and troubleshooting
============================
Also, run the Airport Utility app which is located inside the Utilities folder.
=====================
If using a  Linksys router, contact LinkSys Customer Support and/or post in their forums.
If using Apple's Airport, please re-post over in one of the AirPort Forums.

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