Its not down to any javascript library to throw errors if something has 
happened once and cant happen again... You can modify the source or add 
methods to it if you wish to set a global variable that it has happened and 
check that each time it is called if you wish...

Alex
----- Original Message ----- 
From: "disccomp" <discc...@gmail.com>
To: "Prototype & script.aculo.us" <prototype-scriptaculous@googlegroups.com>
Sent: Wednesday, July 01, 2009 6:44 AM
Subject: [Proto-Scripty] Re: determine if dom:onload has happened yet?


>
> In any case; If an event can only happen once, shouldn't prototype
> throw some error that you can no longer register such an event after
> it has been called?
> >
> 


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