how to know if I'm on-line or not

[Jon]

I'm writing some software to continually test a web site I created. It 
Posts some data every hour or so and then inspects the HTML that returns 
to verify that the web site responded appropriately. 

Sad to say, I connect to the Internet over a modem, so I'm not on-line 
all of the time.  I would like to have some logic like this, so that I 
don't report an error when I'm not even on-line:

if modem-is-connected then
   test the web site
end if

Is there any way to do this in Rev?

:)

Jon