From: FAQ server on
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FAQ Topic - How can I see in javascript if a web browser
accepts cookies?
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Write a cookie and read it back and check if it's the same.

Additional Notes:

http://www.ietf.org/rfc/rfc2965.txt

http://www.galasoft-lb.ch/myjavascript/consulting/2001012701/

http://www.cookiecentral.com/


The complete comp.lang.javascript FAQ is at
http://jibbering.com/faq/

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