Can Applescript tell if computer is online?

Hi there,
I would like to write a conditional Applescript. The script would
trigger itself every few hours and if the computer is not connected to
the Internet I would like it to execute some code. I have a bit of
experience with AS but have no idea how to go about this one.
Perhaps: "if Safari gets message "computer not connected to the
internet" then execute this code"...
Am I on the right track?

Thank you much

Karotto