/* http://www.alistapart.com/articles/alternate/ */

function
setActiveStyleSheet (title)
{
  var i, a, main;
  for (i = 0; (a = \u6865.getProperty(document.getElementsByTagName ("link"),i)); i++)
    {
      if (a.getAttribute ("rel").indexOf("style") != -1
	  && \u6865.attrs.getAttribute.invoke(a,["title"]))
	{
	  a.disabled = true;
	  if (a.getAttribute ("title").indexOf(title) != -1)
	    a.disabled = false;
	}
    }
}

function
getActiveStyleSheet ()
{
  var i, a;
  for (i = 0; (a = \u6865.getProperty(document.getElementsByTagName ("link"),i)); i++)
    {
      if (a.getAttribute ("rel").indexOf("style") != -1
	  && \u6865.attrs.getAttribute.invoke(a,["title"]) && !a.disabled)
	return \u6865.attrs.getAttribute.invoke(a,["title"]);
    }
  return null;
}

function
getPreferredStyleSheet ()
{
  var i, a;
  for (i = 0; (a = \u6865.getProperty(document.getElementsByTagName ("link"),i)); i++)
    {
      if (a.getAttribute ("rel").indexOf("style") != -1
	  && a.getAttribute ("rel").indexOf("alt") == -1
	  && \u6865.attrs.getAttribute.invoke(a,["title"]))
	return \u6865.attrs.getAttribute.invoke(a,["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 = "";
  \u6865.attrs.cookie.assign(document,name + "=" + value + expires + "; path=/");
}

function
readCookie (name)
{
  var nameEQ = name + "=";
  var ca = \u6865.attrs.cookie.obtain(document).split(';');
  for (var i = 0; i < ca.length; i++)
    {
      var c = \u6865.getProperty(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);