router/xp configuration for access a public wi fi network

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suppose i have a public network foo accessible from home.

how can i connect to that "wan" using my router (asus wl500g) ?
    (bridge option on the router requires mac address and i do not
know that).
i just need help with the wan portion since lan portion is obviously
a no brainer (well... would wireless traffic on the lan portion
peacefully with the wireless wan connection?)

if i can't do that:
  can i connect to that network AND to my router i'm running printer/
shared storage of
    using the same wifi card in the laptop or do i need one more wifi
card to connect
    to both networks simultaneously?

thanks for tolerating my multiposting.

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