var nav_advanoverview_off = new Image();
  nav_advanoverview_off.src = "/images/nav_advanoverview_off.gif";
  var nav_advanoverview_over = new Image();
  nav_advanoverview_over.src = "/images/nav_advanoverview_over.gif";

  var nav_issues_off = new Image();
  nav_issues_off.src = "/images/nav_issues_off.gif";
  var nav_issues_over = new Image();
  nav_issues_over.src = "/images/nav_issues_over.gif";

  var nav_subscribe_off = new Image();
  nav_subscribe_off.src = "/images/nav_subscribe_off.gif";
  var nav_subscribe_over = new Image();
  nav_subscribe_over.src = "/images/nav_subscribe_over.gif";

  var nav_mediakit_off = new Image();
  nav_mediakit_off.src = "/images/nav_mediakit_off.gif";
  var nav_mediakit_over = new Image();
  nav_mediakit_over.src = "/images/nav_mediakit_over.gif";


  var nav_schedrates_off = new Image();
  nav_schedrates_off.src = "/images/nav_schedrates_off.gif";
  var nav_schedrates_over = new Image();
  nav_schedrates_over.src = "/images/nav_schedrates_over.gif";

  var nav_articleindex_off = new Image();
  nav_articleindex_off.src = "/images/nav_articleindex_off.gif";
  var nav_articleindex_over = new Image();
  nav_articleindex_over.src = "/images/nav_articleindex_over.gif";