[Moo] Problem with 'complete' option

[egorpromo]

Hi all.
I can not set function that must executes at the end of my Tween
animation.
This is my example: http://jsfiddle.net/zY887/
I set "complete" option in that way: complete:ff(). All right except
this function executes before animation. When i set it in another way:
complete:ff (without brackets after function name) - this do nothing.
Where is my mistake?