jQuery.fn.pulse = function( properties, duration, numTimes, interval) {  
   
   if (duration === undefined || duration < 0) duration = 500;
   if (duration < 0) duration = 500;

   if (numTimes === undefined) numTimes = 1;
   if (numTimes < 0) numTimes = 0;

   if (interval === undefined || interval < 0) interval = 0;

   return this.each(function() {
      var $this = jQuery(this);
      var origProperties = {};
      for (property in properties) {
         origProperties[property] = $this.css(property);
      }

      var subsequentTimeout = 0;
      for (var i = 0; i < numTimes; i++) {
         window.setTimeout(function() {
            $this.animate(
               properties,
               {
                  duration:duration / 2,
                  complete:function(){
                     $this.animate(origProperties, duration / 2)}
               }
            );
         }, (duration + interval)* i);
      }
   });
  
};