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

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

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

// Create a cookie to save the style
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=/";
}

// Read a cookie for the style sheets.
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;
}