Thanks for that friedo
It's all sorted. Just out of interest, is it possible to enter a relative path name? From memory I think I tried that and got the same result but if I'm reading between the lines of your reply correctly I didn't have to use an absolute path.
Comment on Re^2: Problems getting system call to work
Yes, you can pass a relative path. However, it's relative to your current directory, which is not necessarily the one in which the calling script resides. Some web servers set the current directory to the root directory.