var tmp_interval1 = 50;
var tmp_interval2 = 5000;
var interval      = 5000;
var opa_mode      = 1;
var opa_value     = 0.01;
var opa_temp      = 0;
var opa_browser   = 0;
var opa_id        = "header_band1";

function Header_Fade()
{
  if(navigator.userAgent.indexOf("Firefox")!=-1) opa_browser = 1;
  if(navigator.userAgent.indexOf("MSIE")!=-1) opa_browser = 2;
  if(navigator.userAgent.indexOf("Opera")!=-1) opa_browser = 0;

  if(opa_browser>0)
  {
    initiate();
    window.setTimeout("animation()",interval);
  }
};

function initiate()
{
  if(opa_browser==1)
  {
    document.getElementById("header_band1").style.MozOpacity = 0;
    document.getElementById("header_band2").style.MozOpacity = 0;
    document.getElementById("header_band3").style.MozOpacity = 0;
    document.getElementById("header_band4").style.MozOpacity = 0;
  }
  if(opa_browser==2)
  {
    document.getElementById("header_band1").style.filter = "Alpha(opacity=0)";
    document.getElementById("header_band2").style.filter = "Alpha(opacity=0)";
    document.getElementById("header_band3").style.filter = "Alpha(opacity=0)";
    document.getElementById("header_band4").style.filter = "Alpha(opacity=0)";
  }

  document.getElementById("header_band1").src = root_dir+"images/header/header20.jpg";  
  document.getElementById("header_band2").src = root_dir+"images/header/header21.jpg";
  document.getElementById("header_band3").src = root_dir+"images/header/header22.jpg";
  document.getElementById("header_band4").src = root_dir+"images/header/header23.jpg";  
};

function animation()
{
  if(opa_temp==0&&opa_mode==1)
  {
    if(opa_id=="header_band1")
      opa_id = "header_band2";
    else if(opa_id=="header_band2")
      opa_id = "header_band3";
    else if(opa_id=="header_band3")
      opa_id = "header_band4";
    else
      opa_id = "header_band1";
  }

  if(opa_mode==1)
  {
    opa_temp += opa_value;
    if(opa_temp>=0.99)
    {
      opa_mode = 0;
      opa_temp = 0.99;
      interval = tmp_interval2;
    }
    else
      interval = tmp_interval1;
  }
  else
  {
    opa_temp -= opa_value;
    if(opa_temp<=0)
    {
      opa_mode = 1;
      opa_temp = 0;
      interval = tmp_interval2;
    }
    else
      interval = tmp_interval1;
  }

  if(opa_browser==1)
  {
    document.getElementById(opa_id).style.MozOpacity = opa_temp;
  }

  if(opa_browser==2)
  {
    document.getElementById(opa_id).style.filter = "Alpha(opacity="+(opa_temp*100)+")";
  }

  window.setTimeout("animation()",interval);
};