jQuery shake effect like WordPress Login Form

jQuery.fn.shake.js

jQuery.fn.shake = function(intShakes, intDistance, intDuration) {
  this.each(function() {
    $(this).css({
      position: "relative"
    });
    for (var x = 1; x <= intShakes; x++) {
      $(this).animate({
        left: (intDistance * -1)
      }, (((intDuration / intShakes) / 4))).animate({
        left: intDistance
      }, ((intDuration / intShakes) / 2)).animate({
        left: 0
      }, (((intDuration / intShakes) / 4)));
    }
  });
  return this;
};

// demo use
$('form').shake(2, 13, 250); //次数，振幅，频率

It didn't work.

I use following code to test your code:
$('#submit').click(function(){
$('form').shake(2, 13, 250);
alert('stop!');
});

The alert window appeared but the form doesn't shake. Can't you tell me the reason?

BTW: I'm using JQuery 1.10.2.