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IP logging html or java script?
You can't do that in HTML or javascript. It requires for example PHP or ASP ;)
PHP examples: http://www.dreamincode.net/code/snippet212.htm http://www.hawkee.com/snippet/1037/
Yeah PHP would be the easiest way to do it. The most sensible thing would be to google for something like an "IP Logger PHP" or something along those lines.
However if I were you I'd learn PHP and make one yourself. It's really not all that hard.
You just need to specify the logs.txt's location and use the $_SERVER['remote_addr']; command and write all the logs to logs.txt