How do I allow users to run a single command as root?

[tjobrien@tjobrien.traveller.com (Tim O'Brien)]

I've written a few scripts to automatically connect to my ISP, which has 
several incoming lines. What I'd like to do is make these scripts so that
the user running them does not have to be root. I've tried changing the 
permissions to rwx__x__x, still owned by root, but it doesn't do the job.
I need to make this simply a command a user can run without them having
to know the root password.

Any ideas on how to accomplish this? I tried reading the man pages, but 
su (which I think is what I would need to use) is not exactly what I'd   
call well documented. 

Thanks,  

Tim O'Brien 

E-mail: tjobrien@traveller.com