The request was for an auto-away script, which hixxy provided. Yours is okay for a manual away script, but could use some changes.
First of all, there's already an /away command that will do just about the same thing you did with !away, so you'd want it to do something different or else just use /away. Second, you normally don't want to type to the channel !away or !back... it's better to have them internal (/away /back) type thing. Third, don't halt a script unless you need to. Fourth, use $ctime to get a duration instead of /inc. And, finally, you don't need /'s in a script.
