how to extend existing methods functionality in scriptaculous

Hello All,

I'm new to javascript and scriptaculous so I wanted to ask
gurus about
CORRECT way of extending already existing methods. Here is
my example:

we have:
Autocompleter.updateElement() {

...
if (this.options.afterUpdateElement)
      this.options.afterUpdateElement(this.element,
selectedElement);
}

Let's say I want to "submit form" right after user
select new value in
Autocompleter field. What the CORRECT way to accomplish
that? I need
to make something similar to:

function newAfterUpdateElement() {
 .... <do my actions here>...
return this.oldAfterUpdateElement();
}

Autocompleter.prototype.options.oldAfterUpdateElement=Autoco
mpleter.prototype.options.afterUpdateElement;
Autocompleter.prototype.options.afterUpdateElement=newAfterU
pdateElement;

thanks,

bigral
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