Fadeout and remove objects.

gistfile1.txt

  $('#glass').mousedown(function(evt){
    var $thumb = $('<img src="img/thumbprint.png" class="thumbprint">')
      .css({top:evt.offsetY-30, left:evt.offsetX-20, opacity:1, rotation:90}) //, "-webkit-transform": "rotate("+((Math.random()*30)-15)+" deg)"
      .delay(1000)
      .animate({opacity:0}, 2000, function(){$(this).remove();});
    $(this).append($thumb);
  });