There's no way to do this with HTML. At least, no way without a lot of error problems, incompatibility with browsers, etc.

It's probably better to look at your streaming software and try to determine from that how long a stream has been served, possibly backending it with perl and the web server to determine whom the person viewing is, so that you can charge correctly. But any solution solely based on just the web server and HTML is prone to errors, both in your favor (overcharging) and against (under/no charge).

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Dr. Michael K. Neylon - mneylon-pm@masemware.com || "You've left the lens cap of your mind on again, Pinky" - The Brain