>No, that's not correct.  isDefined DOES work for URL variables.  (It does
>NOT work for CGI variables)
>
><cfif isDefined("url.id")>do something

but if I do:
<cfif isDefined(url.id)>
crap here
</cfif>

it fails with an error, "isDefined(url.id)"

Mine doesn't have the quotes and yours does.  Though with yours, it was always defined whether it was or not, I think.  As you can see, I'm kinda new at this.

Pre-difining it and then testing for the pre-defined state seemed to work.
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