If you google "warning reference to undefined property" (without the
quotes), you'll find several pages discussing this issue.  It relates
to Firefox's javascript.options.strict option, which sounds like a
good idea but apparently has issues.

T.J. Crowder
tj / crowder software / com

On Sep 9, 8:16 am, Erwin <[EMAIL PROTECTED]> wrote:
> Hi guys,
> I wrote the following code :
> $$('ul#list_works > li.clicked').each( function(x)
> { x.removeClassName('clicked'); } );
> which seems to work fine, but I can see the follwoing error in the js
> console :
> Warning : reference to undefined property responder[callback]
> source file :http://localhost:3000/javascripts/prototype.js?1220608011
> Line : 1140
> what is the meaning of this warning ? cannot google any link to some
> clear explanation
> I am running version of Prototype
> thanks for your lights
> Erwin
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