Mac to wireless broadband

[the social g]

I have just moved into shared accommodation with wireless broadband. all the computers in the house are PCs, I have a G5 iMac. When I tried to connect ,airport picked up the router (and the next door neighbour's for that matter) but would not let me connect. Bearing in mind I havn't got a clue what I'm talking about, anybody got any suggestions? The router is a D-Link DSL-G604T if thats any help.

[fo3nix]

Is there a password on the router? Your mac is perfectly compatible with it (in fact, macs have better wireless support than windows does). One thing to note is, if it does have a password, the length of the password:

See this:
http://docs.info.apple.com/article.html?artnum =108058