[jQuery] animate() syntax question

[pixeline]

hi friends,

i've had this question lying for so long in the bottom of my mind, i
thought i should finally clear it up:

I'm using a lot the animate() function, using a callback, and no
easing parameter. Such as:



$('div').animate({width: 400},'fast', function(){
         $(this).addClass('visible');
});


i 'm wondering if i should actually leave an empty argument for the
easing parameter (because i want the "linear" easing method)

$('div').animate({width: 400},'fast',null, function(){
         $(this).addClass('visible');
});


or if i can just do like i did in the first example , skip it
entirely?