Smooth scroll to div id jQuery

I’ve been trying to get a scroll to div id jquery code to work correctly. Based on another stack overflow question i tried the following

DEMO http://jsfiddle.net/kevinPHPkevin/8tLdq/

$('#myButton').click(function() {
   $.scrollTo($('#myDiv'), 1000);
});

But it didn’t work. It just snaps to the div. I also tried

$('#myButton').click(function(event) {
     event.preventDefault();
   $.scrollTo($('#myDiv'), 1000);
});

With no progress.