DNS issue with Wireless Connection

At our school we have run into an issue where no one with a Vista machine can
access the WAN from a wireless connection. They are only able to establish a
local connection. They can see the WAP and can see the Gateway but the WAN
or internet is X'ed out.

We are able to get access to the WAN from a hard line connection on the same
machines. On my machine I am able to get a connection at home to the web,
but when I bring it back to school I am only able to achieve a local
connection.

I stronly feel it is a DNS issue becasue I can ping things out on the WAN if
I know the IP. I am unable to then ping the same object using its name. So
I am not getting any domain name translation.
I am troubled by the fact that if I attach the same machine to a hard line
connection I am able to get DNS resolution and it appears as if there is no
issue at all.

Any suggestions would be welcome and thank you in advance.