var myVar;

function showDiv() {
  var random = Math.floor(Math.random() * $('.notification').length);
  $('.notification').eq(random).prependTo('.container').fadeIn(200).delay(3000).fadeOut(200);
  createRandomInterval();
}

function createRandomInterval() {
  setTimeout(showDiv, 500 + Math.random() * 4000);
}
$(document).ready(function() {
  createRandomInterval();
});