Event callback signature comparison

The callback signature for mouseenter and mouseleave subscriptions should match that of non-special events (e.g. click)

Click subs

YAHOO.util.Event.on('a', 'click', callback, 'foo');

Click on the red box

YAHOO.util.Event.delegate('b', 'click', callback, 'em', 'foo');

Click on either "one" or "six"

Mouseenter subs

YAHOO.util.Event.on('x', 'mouseenter', callback, 'foo');

Click on the red box

YAHOO.util.Event.delegate('y', 'mouseenter', callback, 'em', 'foo');

Mouse over either "one" or "six"