if (document.images) {
//initialise navigation images
  var image1 = new Image();
  image1.src = "/images/menu_events_r1_c1_f2.jpg";

  var image2 = new Image();
  image2.src = "/images/menu_events_r2_c1_f2.jpg";

  var image3 = new Image();
  image3.src = "/images/menu_events_r3_c1_f2.jpg";

  var image4 = new Image();
  image4.src = "/images/menu_events_r4_c1_f2.jpg";

  var image5 = new Image();
  image5.src = "/images/menu_marketing_r1_c1_f2.jpg";

  var image6 = new Image();
  image6.src = "/images/menu_marketing_r2_c1_f2.jpg";

  var image7 = new Image();
  image7.src = "/images/menu_marketing_r3_c1_f2.jpg";

  var image8 = new Image();
  image8.src = "/images/menu_marketing_r4_c1_f2.jpg";

  var image9 = new Image();
  image9.src = "/images/menu_pr_r1_c1_f2.jpg";

  var image10 = new Image();
  image10.src = "/images/menu_pr_r2_c1_f2.jpg";

  var image11 = new Image();
  image11.src = "/images/menu_pr_r3_c1_f2.jpg";

  var image12 = new Image();
  image12.src = "/images/menu_pr_r4_c1_f2.jpg";

  var image13 = new Image();
  image13.src = "/images/menu_publishing_r1_c1_f2.jpg";

  var image14 = new Image();
  image14.src = "/images/menu_publishing_r2_c1_f2.jpg";

  var image15 = new Image();
  image15.src = "/images/menu_publishing_r3_c1_f2.jpg";

  var image16 = new Image();
  image16.src = "/images/menu_publishing_r4_c1_f2.jpg";

  var image17 = new Image();
  image17.src = "/images/menu_publishing_r5_c1_f2.jpg";

  var image18 = new Image();
  image18.src = "/images/menu_training_r2_c1_f2.jpg";

  var image19 = new Image();
  image19.src = "/images/menu_training_r3_c1_f2.jpg";

  var image20 = new Image();
  image20.src = "/images/menu_training_r4_c1_f2.jpg";

  var image21 = new Image();
  image21.src = "/images/nav_home-over.jpg";

  var image22 = new Image();
  image22.src = "/images/nav_relations-over.jpg";

  var image23 = new Image();
  image23.src = "/images/nav_marketing-over.jpg";

  var image24 = new Image();
  image24.src = "/images/nav_events-over.jpg";

  var image25 = new Image();
  image25.src = "/images/nav_training-over.jpg";

  var image26 = new Image();
  image26.src = "/images/nav_publishing-over.jpg";

  var image27 = new Image();
  image27.src = "/images/nav_publications-over.jpg";

  var image28 = new Image();
  image28.src = "/images/nav_partners-over.jpg";

  var image29 = new Image();
  image29.src = "/images/nav_contact-over.jpg";

}