Bounce Effect - Simple Bounce Effect using only jQuery (and not jQuery UI).

index.html

<div id="hopper"></div>

script.js

function Bounce(ele, times, distance, speed) {
  for (var i = 0; i < times; i++) {
    ele.animate({
      marginTop: '-=' + distance
    }, speed).animate({
      marginTop: '+=' + distance
    }, speed);
  }
}

$('#hopper').on('click', function() {
  Bounce($(this), 2, '20px', 400);
});

style.css

#hopper {
    height: 150px;
    width: 150px;
    background-color: green;
    margin-top: 50px;
    margin-left: auto;
    margin-right: auto;
    -o-border-radius: 5px;
    -webkit-border-radius: 5px;
    -moz-border-radius: 5px;
    border-radius: 5px;
}

for-loop is missing the declaration of i.