one uri for wap/html?

Hello All,
I need to be able to take an established html address ie:-

http://mysite.com/index.html

so that if it is accessed via a cellphone I can redirect it to an approriate
WAP page.

I've thought of SSI to get back to the server, but that has to be embeded
into the html document which the cellephone I'm thinking will reject.

Has anyone got any ideas how I can redirect a cellphone from an established
html address to a more apropriate WAP page.

Many Thanks
Peter Newton

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