[Moo] cant erase element why not?

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Hello i need help with erasing an array from a list.
I do not understand why it is not working.

var complain = [];

complain.push(bildID);  //works fine  console.log shows: [1002, 1005,
1003, 1001]

var element = new Element('li', {
     'id': bildID,
     'html': complaintext
}).inject('complainContainer','top');


element.addEvent('click', function(event) {
        complain.erase(element.get('id'));               //do not work
        element.dispose();                                   //works
fine
        alert("delete: " + element.get('id'));            // it shows
the right ID
        });

...


thanks in advance for any help



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