var banners = new Array();
var curbanner = -1;
var bannertimeout = null;
function init_switch_banners()
{
  var div = document.getElementById("switchbanners");
  var a = div.getElementsByTagName("a");
  if (a && a.length)
  {
    for (var i=0; i<a.length; ++i)
      if (a[i].className == 'bannerlink')
        banners.push(a[i]);
    
    if (banners.length > 1)
      next_banner();
    else if (banners.length == 1)
      banners[0].style.display = 'block';
  }
}
function next_banner()
{
  if (curbanner >= 0)
    banners[curbanner].style.display = 'none';
  ++curbanner;
  if (curbanner >= banners.length)
    curbanner = 0;
  banners[curbanner].style.display = 'block';
  bannertimeout = window.setTimeout("next_banner()", 10000);
}