Help..wireless problem

hi

i wonder if anybody can help me....

i recently bought a Zoom ADSL X6 wireless router which i have set up and so far can only access internet via ethernet cable. I have an apple ibook os 10.3 and have a D Link DWL 122 usb wireless dongle.

The problem is that when i remove ethernet cable, although mac says it is connected to network (via usb dongle), when i open a browser i cant access net. However, my Nintendo Wii can access wireless network and browse the net and play online games.

im not expert, but presume something is wrong with my network settings?

hope somebody can help? please feel free to ask questions as im proabably not being that clear!

thanks

mark