var BannerSrc = "";
var BannerNo  = 0;

function cycleBanners()
{
  if (++BannerNo > 15) BannerNo=0;
  getNextBanner();
  window.document.images['logo_banner'].src = BannerSrc;
  window.setTimeout('cycleBanners();', 3000);
}



function getNextBanner()
{
  var BannerList = new Array('Banner_logo.gif',
                             'Banner_01.jpg',
                             'Banner_02.jpg',
                             'Banner_03.jpg',
                             'Banner_logo.gif',
                             'Banner_04.jpg',
                             'Banner_05.jpg',
                             'Banner_06.jpg',
                             'Banner_logo.gif',
                             'Banner_07.jpg',
                             'Banner_08.jpg',
                             'Banner_09.jpg',
                             'Banner_logo.gif',
                             'Banner_10.jpg',
                             'Banner_11.jpg',
                             'Banner_12.jpg');

  BannerSrc = 'images/' + BannerList[BannerNo];
}



function changeNavImage(NoNavImg, ImageSrc)
{
  document.getElementById('NavImg_'+ NoNavImg   ).style.backgroundImage='url(' + ImageSrc +')';
  document.getElementById('NavImg_'+(NoNavImg+1)).style.backgroundImage='url(' + ImageSrc +')';
}