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<!DOCTYPE html>
<html>
<head>
<script class="jsbin" src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.1/jquery.js"></script>
<meta charset=utf-8 />
<title>Pulsate</title>
<style>
  div { clear: left; margin-bottom: 2em; }
  .pulsating-block {
    width: 6em; height: 4em;
    margin: 0.5em; margin-right: 10em;
    float: left; clear: none; position: relative;
    background: lightblue;
    text-align: center;
    padding-top: 2em;
    font: bold 1em sans-serif;
  }
</style>
</head>
<body>
  <div>
    <div class="Linear opacity pulsating-block">linear</div>
  
  </div>
</body>
</html>
 
(function ($) {
  $.fn.pulsate = function (properties, duration, type, speed, callback) {
    type = type || 'Swing'
    speed = speed || 'Normal';
    this.animate(properties, duration, 'pulsate' + type + speed, callback);
  };
                 
  function createPulsateLinear (speed) {
    speed *= 2;
    return function (p, n) {
      return (Math.asin(Math.sin(Math.PI * n / speed)) + Math.PI / 2) / Math.PI;
    }
  }
                 
  function createPulsateSwing (speed) {
    return function (p, n) {
      return (1 + Math.sin(n / speed)) / 2;
    }
  }
                 
  function createPulsateBounce (speed) {
    speed *= 2;
    return function (p, n) {
      return (
        ((Math.asin(Math.sin(Math.PI * n / speed)) + Math.PI / 2) / Math.PI) *
        (Math.sin(Math.PI * n / speed) + 1) / -2 + 1
      );
    }
  }
  
  var speeds = {
    fast: 100,
    normal: 200,
    slow: 1000
  }
   
  $.extend(jQuery.easing, {
    pulsateLinearFast: createPulsateLinear(speeds.fast),
    pulsateLinearNormal: createPulsateLinear(speeds.normal),
    pulsateLinearSlow: createPulsateLinear(speeds.slow),
    pulsateSwingFast: createPulsateSwing(speeds.fast),
    pulsateSwingNormal: createPulsateSwing(speeds.normal),
    pulsateSwingSlow: createPulsateSwing(speeds.slow),
    pulsateBounceFast: createPulsateBounce(speeds.fast),
    pulsateBounceNormal: createPulsateBounce(speeds.normal),
    pulsateBounceSlow: createPulsateBounce(speeds.slow)
  });
})(jQuery);
​
$(document).ready(function() {
  var
    pulsatingBlocks = $('.pulsating-block'),
    forever = 5 * 24 * 60 * 60 * 1000; // 5 days! (Which is forever in Internet time)
  
  pulsatingBlocks.filter('.opacity').each(function () {
    $(this).pulsate({left: "+=500"}, forever, this.className.split(' ')[0], 'Slow');
  });
    
  pulsatingBlocks.filter('.top').each(function () {
    $(this).pulsate({top: 100}, forever, this.className.split(' ')[0], 'Fast');
  });
  
});
​
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