jquery.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)), "swing")
        .animate({left:intDistance}, ((intDuration/intShakes)/2), "swing")
        .animate({left:0}, (((intDuration/intShakes)/4)), "swing");
      }
    });
  return this;
};