Fade in fade out

gistfile1.txt

$(document).ready(function() {
  setTimeout(function() {
    transition("col1")
  }, 2000);
});

function transition (id) {
  var id = '#' + id;
  
  $(id + ':first-child').fadeOut('fast', function() {
    $(id + ':last-child').fadeIn('fast', function() {
      var last = $(id + ':last-child');
      console.log(last);
    });
  });