Ping script to email on server fail

Hi,

Im looking for a script that will ping a list of servers (preferably in a text file) continuously unless there is no response, i.e the server is down. If there is no response I would like an email to be sent to specific people. If the message and subject can be changed that would be another great advantage.

I have looked around some forums but cant seem to find one that works as I want and the free software that?s available cant be used in our work environment.

Any help would be greatly appreciated,

Thanks

Dan