[Moo] how to give a function to options?

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Hello cracks,
I would like to give a function-name as an option to my
element.implement.
element.implement shout execute the function.
with my code, I have always the error that <make> is not a function.
whats wrong?
her my code:

        function incubeHover() {
                incube_hover.toggleClass('hover');
        }

Element.implement({
    letterhover: function(options){
      var myOptions = options || {},
      make = myOptions.make || function(){};
...

        this.addEvents({
            mouseleave: function(e){
                make();
            },
            click: function(e){

                }
        });

    }

});


and here is my call:

                        creator.letterhover({
                                'make' : 'incubeHover()'
                        });

thx for any help