Volume freespace

[John Lowrey <jlowrey at mac dot com>]

Hello all,

I am trying to figure out how to get the available freespace on a 
volume.  My attempts with Applescript have come to naught.  This is 
what I have:
on run (diskname)
        tell application "Finder"
                set answer to freespace of disk diskname
        end tell
        return answer
end run

I can't get it to return a value to RB under Mac OS X.  Any suggestions?

Thanks,

John