$(document).ready(function () {
  var images = ['<img alt="Baloon1" src="/images/baloons/baloon1.png?1313477979" />','<img alt="Baloon2" src="/images/baloons/baloon2.png?1313478002" />','<img alt="Baloon3" src="/images/baloons/baloon3.png?1313478005" />','<img alt="Baloon4" src="/images/baloons/baloon4.png?1313478008" />','<img alt="Baloon5" src="/images/baloons/baloon5.png?1313478012" />'];
  var index = Math.floor(Math.random()*images.length);
  $('.baloon-with-text').html(images[index]);
});