human language detection?

Hi, I am creating a bilingual website (Dutch and English) and I wonder how I would best detect the human language of a visitor. I am attempting several things, but I am sure there must be a generally accepted alternative. Can anyone point me to more info? I am tinkering around with HTTP_REFERER and HTTP_USER_AGENT and a bit in JavaScript which only works with Netscape browsers. But detection usually fails. I was wondering, my server provides a REMOTE_ADDR value, but not a REMOTE_HOST. From the last I could look voor a ".nl" extention. Is there a way to (inline) translate a IP address to something readable? It's a remote server on which I can't control the settings. Why is this so difficult? It should be a basic feature of any international software... or am I missing something? Thanks, Marco -- Marco Bleeker, Amsterdam, NL. Please do not distribute my email address to a third party Refer to www.ecocam.com for an email form (and more)