network problem

[sinanatay]

i'm using a brand new powerbook g4 and using a wireless connection.After 3 days of fast surfing, safari starts to give errors like :'you are not connected to the internet' 'safari can't find server'.First i tought there was a problem with my wireless system but then i realized i can get the adium (messenger) online and chat with my friends while safari gives errors,then i started network diagnostics..sometimes it says that i'm online sometimes it says that i'm not, even if i'm online the connection to the web sites is so slow (the airport show max connection level everytime i check) hope i could tell my problem with my english please help me.