function subnavi_open( id ){
  var subnavi = document.getElementById(id);

  createCookie(id,'block');

  subnavi.style.display = "block";
  return;
}

function subnavi_close(id){
  var subnavi = document.getElementById(id);

  createCookie(id,'none');

  subnavi.style.display = "none";
  return;
}

function subnavi_onclick( id ){
  
  if (document.getElementById){
  
    var subnavi = document.getElementById(id);
    
    if (subnavi.style.display != "block") {
      subnavi.style.display = "block";
      createCookie(id,'block');
    } else {
      subnavi.style.display = "none";
      createCookie(id,'none');
    }
    return false;
    
  } else {
    return true;
  }
}

function onload_subnavi (){
  var subnavi = readCookie('subnavi1');
  if( subnavi == 'block' ){
    subnavi_open( 'subnavi1' );
  }else{
    subnavi_close( 'subnavi1' );
  }
  subnavi = readCookie('subnavi2');
  if( subnavi == 'block' ){
    subnavi_open( 'subnavi2' );
  }else{
    subnavi_close( 'subnavi2' );
  }

  subnavi = readCookie('subnavi3');
  if( subnavi == 'block' ){
    subnavi_open( 'subnavi3' );
  }else{
    subnavi_close( 'subnavi3' );
  }

  subnavi = readCookie('subnavi4');
  if( subnavi == 'block' ){
    subnavi_open( 'subnavi4' );
  }else{
    subnavi_close( 'subnavi4' );
  }
}

/* -------------------------------------------- */

function createCookie(name,value,days) {
  if (days) {
    var date = new Date();
    date.setTime(date.getTime()+(days*24*60*60*1000));
    var expires = "; expires="+date.toGMTString();
  }
  else expires = "";
  document.cookie = name+"="+value+expires+"; path=/";
}

function readCookie(name) {
  var nameEQ = name + "=";
  var ca = document.cookie.split(';');
  for(var i=0;i < ca.length;i++) {
    var c = ca[i];
    while (c.charAt(0)==' ') c = c.substring(1,c.length);
    if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
  }
  return null;
}


window.onload = function(e) {
  onload_subnavi();
}