Thank you Semme.

I could not get a preview or post it.

I thought that something was wrong with phpBB.

I can now preview this post.

I hope that I can now post it.

I have now found a much more useful programme to do the job.
It can be found here http://codebox.org.uk/pages/bitmeteros/downloads
. It's GPL, it is also cross platform and displays in the browser window.

I downloaded the linux version, which turned out to be a deb, and slacko had no trouble ...

Thanks to those who have replied.
It would have been great if my ISP had my web usage displayed some where on their website, but they don't.
So I have followed the link suggested by MrToad and I have down loaded William (Dthdealer) 's script.
It works ok, but you need to read the forum thread for ...

I have only recently got myself connected to the internet at home. My isp allows 5Gbs of web usage per month with the package I have signed up for. I am using thin slacko to access the internet, because I did not trust Windows to be secure enough.

What I want is a small programme to keep adding up ...