get event.target in focusin binding function

I am fixing a problem in jQuery.Validator.js. I have to get the current input in the 'onfocusin'.

It seems that the "event.target" is what I needed.

But how can I get the event object in the follwing binding function?

<code> $.extend($.validator, {   defaults: {           ......   onfocusin: function(element) {               // how to get event.target here?               ......         }         }

</code>

Thanks! Arthur