var aryImages = new Array(26);

  aryImages[0] = "/cesc/images/home_off.gif";
  aryImages[1] = "/cesc/images/home_on.gif";
  aryImages[2] = "/cesc/images/about_off.gif";
  aryImages[3] = "/cesc/images/about_on.gif";
  aryImages[4] = "/cesc/images/cesc2005_off.gif";
  aryImages[5] = "/cesc/images/cesc2005_on.gif";
  aryImages[6] = "/cesc/images/cesc2007_off.gif";
  aryImages[7] = "/cesc/images/cesc2007_on.gif";
  aryImages[8] = "/cesc/images/register_off.gif";
  aryImages[9] = "/cesc/images/register_on.gif";
  aryImages[10] = "/cesc/images/agenda_off.gif";
  aryImages[11] = "/cesc/images/agenda_on.gif";
  aryImages[12] = "/cesc/images/hotel_off.gif";
  aryImages[13] = "/cesc/images/hotel_on.gif";
  aryImages[14] = "/cesc/images/posters_off.gif";
  aryImages[15] = "/cesc/images/posters_on.gif";
  aryImages[16] = "/cesc/images/07agenda_off.gif";
  aryImages[17] = "/cesc/images/07agenda_on.gif";
  aryImages[18] = "/cesc/images/exhibits_off.gif";
  aryImages[19] = "/cesc/images/exhibits_on.gif";
  aryImages[20] = "/cesc/images/attendees_off.gif";
  aryImages[21] = "/cesc/images/attendees_on.gif";
  aryImages[22] = "/cesc/images/poster_abst_off.gif";
  aryImages[23] = "/cesc/images/poster_abst_on.gif";
  aryImages[24] = "/cesc/images/confinfo_off.gif";
  aryImages[25] = "/cesc/images/confinfo_on.gif";



  for (i=0; i < aryImages.length; i++) {
    var preload = new Image();
    preload.src = aryImages[i];
  }


  function swap(img,imgIndex) {
    document[img].src = aryImages[imgIndex];
  }