$(document).ready(function() {
  var randomImages = ['DSC00914','DSC01491','DSC01564', 'DSC03208', 'DSC05005'];
  var rndNum = Math.floor(Math.random() * randomImages.length);
  $("img#bgimg").attr({ src: "http://www.magnet-films.com/Images/backgrounds/" + randomImages[rndNum] + ".jpg" });
  var FullscreenrOptions = { width: 1408, height: 1056, bgID: '#bgimg' };
  jQuery.fn.fullscreenr(FullscreenrOptions);
});