> <cfif IsDefined("CGI.HTTP_REFERER")> checks for it's existence

Actually, I'm pretty sure that IsDefined always returns true for any CGI
variable, whether it actually exists or not. For example, this would return
true:

<cfif IsDefined("CGI.I_MADE_THIS_UP")>

Dave Watts, CTO, Fig Leaf Software
http://www.figleaf.com/

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