Alex has given you the solution, but I thought I'd explain it.
var options = { onEnd: cool()}
means "Run cool(), and whatever the result is, assign that to the
property onEnd"
var options = { onEnd: cool}
means "Assign the object cool (which happens to be a function) to the
property onEnd"
If you want to pass arguments to that future-invocation-of-cool you
need to wrap it up, most easily in a closure:
var myarg;
var options = { onEnd: function() {cool(myarg);}}
which means "Assign an anonymous function which will run cool(myarg)
to the property onEnd.
Colin
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