Morris js effect

I need to set effect of Morris chart. example effect go in or go out of Morris Chart. Please Help me . Thanks

        var bar2 = new Morris.Line({
        element: 'line-example',
        data: [
          { y: '2006', a: 100, b: 90 },
          { y: '2007', a: 75,  b: 65 },
          { y: '2008', a: 50,  b: 40 },
          { y: '2009', a: 75,  b: 65 },
          { y: '2010', a: 50,  b: 40 },
          { y: '2011', a: 75,  b: 65 },
          { y: '2012', a: 100, b: 90 }
        ],
        xkey: 'y',
        ykeys: ['a', 'b'],
        labels: ['Series A', 'Series B']
      });

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