From
$('#slot1').animate({
    top: "-=50"
  }, {
    duration: 750,
    specialEasing: {
      top: 'easeInQuad'
    },
    complete: function () {
    	$('#slot1').css('top', 0);
    }
  });

  $('#slot2').animate({
	    top: "-=50"
	  }, {
	    duration: 750,
	    specialEasing: {
	      top: 'easeInQuad'
	    },
	    complete: function () {
	    	$('#slot2').css('top', 0);
	    }
	  });

  $('#slot3').animate({
	    top: "-=50"
	  }, {
	    duration: 750,
	    specialEasing: {
	      top: 'easeInQuad'
	    },
	    complete: function () {
	    	$('#slot3').css('top', 0);
	    }
	  });
To
$('#slot1, #slot2, #slot3').animate({
    top: "-=50"
  }, {
    duration: 750,
    specialEasing: {
      top: 'easeInQuad'
  },
  complete: function(){
    $(this).css('top', 0);
  }
});