function setActiveStyleSheet(title) {
  var i, a, main;
  for(i=0; (a = document.getElementsByTagName("link")[i]); i++) {
    if(a.getAttribute("rel") && a.getAttribute("rel").indexOf("style") != -1 && a.getAttribute("title")) {
      a.disabled = true;
      if(a.getAttribute("title") == title) a.disabled = false;
    }
  }
}

function getActiveStyleSheet() {
  var i, a;
  for(i=0; (a = document.getElementsByTagName("link")[i]); i++) {
    if(a.getAttribute("rel") && a.getAttribute("rel").indexOf("style") != -1 && a.getAttribute("title") && !a.disabled) return a.getAttribute("title");
  }
  return null;
}

function getPreferredStyleSheet() {
  var i, a;
  for(i=0; (a = document.getElementsByTagName("link")[i]); i++) {
    if(a.getAttribute("rel") && a.getAttribute("rel").indexOf("style") != -1
       && a.getAttribute("rel").indexOf("alt") == -1
       && a.getAttribute("title")
       ) return a.getAttribute("title");
  }
  return null;
}

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) {
  var cookie = readCookie("style");
  var title = cookie ? cookie : getPreferredStyleSheet();
  setActiveStyleSheet(title);
}

window.onunload = function(e) {
  var title = getActiveStyleSheet();
  createCookie("style", title, 365);
}

var cookie = readCookie("style");
var title = cookie ? cookie : getPreferredStyleSheet();
setActiveStyleSheet(title);

/*********** サブメニューの表示非表示 ***********/
var timer_id = null;
function showmenu( parent, id )
{
  var target = document.getElementById( id );
  var top = 0;
  var left = 0;
  var obj = parent.offsetParent;
  for( ;; )
  {
    if( ! obj )
      break;

    top += obj.offsetTop;
    left += obj.offsetLeft;

    obj = obj.offsetParent;
  }

  target.style.top = top + parent.offsetTop;
  target.style.left = left + parent.offsetLeft + parent.offsetWidth;
  target.style.display = '';
  if( timer_id )
  {
    clearTimeout( timer_id );
    timer_id = null;
  }
}

function onmousemenu()
{
  if( timer_id )
  {
    clearTimeout( timer_id );
    timer_id = null;
  }
}

function hiddenmenu(id)
{
  timer_id = setTimeout( "closeMenu('"+id+"')", 400 );
}

function closeMenu(id)
{
  var submenu = document.getElementById( id );
  submenu.style.display = 'none';
  timer_id = null;
}