What do you have so far?
We aren't going to write the code out for you. We can help you if you get stuck somewhere.
For starters, you need to tell us what platform this is running on. As the ping command is slightly different between windows and linux.
Also refreshing every minute seems like too much, specially if you are sequentially pinging many things. As it may take time to ping, and if there is no answer or any type of delay you're likely to refresh before all pings complete. Also pinging constantly causes traffic and may impact your network's performance. I'd say at least 15 minutes between pings.
You'll want to have an array with the IPs to ping, so you can step through it and ping.
Other than that, it should be rather straight forward using the system or passthru functions.
----------------------------------
Phil AKA Vacunita
----------------------------------
Ignorance is not necessarily Bliss, case in point:
Unknown has caused an Unknown Error on Unknown and must be shutdown to prevent damage to Unknown.
Web & Tech