var banindex = 1;
var opacity_degree = 0;
var overall_time = 0;
u = setInterval('change_opacity()',75);

function change_opacity()
{
  if (overall_time == 10000)
  {
    opacity_degree = opacity_degree + 0.1;
    var ie_opacity_degree = opacity_degree*100;
    ban_in = document.getElementById('banner'+banindex);
    if (banindex == 5)
    {
      var next_ban_index = 1;
    } else {
      var next_ban_index = banindex + 1;
    }
    ban_out = document.getElementById('banner'+ next_ban_index);
    ban_out.style.opacity = opacity_degree;
    ban_out.style.filter = 'alpha(opacity=' + ie_opacity_degree + ')';
    ban_in.style.opacity = 1 - opacity_degree;
    ban_in.style.filter= 'alpha(opacity=' + (100 - ie_opacity_degree) + ')';
    if (opacity_degree >= 1)
    {
      overall_time = 0;
      opacity_degree = 0;
      banindex = banindex + 1;
      if (banindex == 6)
      {
        banindex = 1;
      }
    }
  } else {
    overall_time += 100;
  }
}