Hi GB....
You cannot do this in plain
HTML code as you will need some form of database and scripting code behind it.
If you intranet users all have direct access to the internet, then I would strongly recommend going to statcounter.com and registering for one of their free accounts. It will give you a simple counter that will count all time page loads. It will also give you detailed stats of the last 100 entries in the log.
They give you a very small piece of javascript to include on each page and installation is so easy.
Hope this helps.