title: Show next div when button pressed
body: <p>I am trying to create a list with five list items. By default there is only the first item shown and if i press a button "Next one" it shows next list item (and so on). </p>
  
  <p>After reaching to the last item button shoud be disabled because there is no list items left.</p>
  
  <p>How can i achieve this kind of behavior?</p>
  
  <p>I have found this example here: <a href="https://stackoverflow.com/questions/28535226/javascript-show-next-div-and-hide-previous">JavaScript - show next div and hide previous</a>
  but this one hides previous one. </p>
  
  <p>Maybe it can be combined with "addclass" function to add class ul siblings that haveent got a class?</p>
  
  <p>Thanks for help.</p>