var width = $(window).width();

​

var data = [

  { el: '#about .image img.flex', plus: 600, newClass: "slideLeft" },

  { el: '#author .image img.flex', plus: 600, newClass: "slideRight" },

  { el: '#feed .blog_01', plus: 600, newClass: "oneUp" },

  { el: '#feed .blog_02', plus: 600, newClass: "twoUp" },

  { el: '#feed .blog_03', plus: 600, newClass: "thrUp" },

  { el: '#feed .more', plus: 1000, newClass: "moreUp" }

];

​

if(width >= 1025) {

  $(window).scroll(function() {

    data.forEach(function(d) {

      $(d.el).each(function() {

        var position = $(this).offset().top;

        var top = $(window).scrollTop();

        if (position < (top + d.plus)) { $(this).addClass(d.newClass); }

      });

    });

  });

} else { 

  data.forEach(function(d) {

    $(d.el).addClass('visible');

  });

}