DN> The result of ( avail / total ) is obviously less than 1, and it will
 DN> result in an integral result (0) rather than a float. Already you've
 DN> truncated your result.

 DN> Try:

 DN>     float( avail ) / float( total ) * 100

I think you've been using C++ for too long!  :-)  That syntax 
does not work with C.  BFN.  Paul.
@EOT:

--- Mksmsg