You want to use either function#call() or function#apply....
Definitions (from https://developer.mozilla.org/)

function#call():
Calls a function with a given *this *value and *arguments * provided
individually.

  $('aDiv').morph('background:#00ff00; width:300px;', {
    afterFinish:callExample.call(this, 'aString')
  });
  function callExample(szStr){
    console.log(szStr);
  }


function#apply()
Calls a function with a given *this *value and *arguments *provided as an
array

  $('aDiv').morph('background:#00ff00; width:300px;', {
    afterFinish:applyExample.apply(this, ['aString', 'test'])
  });
  function applyExample(){
    console.log(arguments);
  }

Or Prototype's Function#bind()

  $('aDiv').morph('background:#00ff00; width:300px;', {
    afterFinish: bindExample.bind(this, 'aString')
  });
  function bindExample(){
    console.log(arguments);
  }



I noticed you're alert()'ing your debugging output... i would recommend
using FireBug.

Rick



On Wed, Sep 9, 2009 at 1:45 PM, mau <mauro.torr...@gmail.com> wrote:

>
> Hi everybody!
>
>  I was wandering if anyone knows how to pass custom parameter to an
> effect callback function, I've tried something like this, but it's
> strange the behavior, works the first time, and then stops.
>
>  $('aDiv').effect({afterFinish:changeSomething('aString'});
>
>
> function changeSomethin(szStr){
>
>  alert(szStr);
> }
>
>
> >
>

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