biddog

Never a silly question - I asked the same thing when I started in business.

Bookmark this page.

http://www.ozforex.com.au/cgi-bin/spotrates.asp
(NOTE THE CHART HAS THE BASE RATE SET FOR AUS$, NOT US$,
hnce my comment below).

A couple of currency converters on this page but you
can use GOOGLE to search for currency converters and a heap based in the US will come up.

If you get stuck (which I don't think you will), PM me.