Encoding special chars (eg '+') in CGI form data

Hi

What general rules do people use when users try (or want) to encode 
special chars in form data? Use JS to exclude them, or...

URLS of such chars:

http://webdesign.about.com/od/forms/a/url_encoding.htm

https://developer.mozilla.org/en-US/docs/JavaScript/Reference/Global_Objects/encodeURI

TIA

-- 
Ron Savage
http://savage.net.au/
Ph: 0421 920 622

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