// switch styles
function setActiveStyleSheet(title) {
  var i, a, main;
  var links = document.getElementsByTagName("link");
  var disabling = false;
  for (i=0; (a = links[i]); i++) 
  {
    if (a.getAttribute("rel") &&
        a.getAttribute("rel").indexOf("style") != -1 &&
        a.getAttribute("title")) 
    {
        if(a.getAttribute("title") != title && a.disabled != true)
        {
//            alert("disabling " + a.outerHTML + "\na.disabled: " + a.disabled + "\ntitle" + title);
            a.disabled = true;
            disabling = true;
        }
     }
  }
  for (i=0; (a = links[i]); i++) 
  {
    if (a.getAttribute("rel") &&
        a.getAttribute("rel").indexOf("style") != -1 &&
        a.getAttribute("title")) 
    {
        if(a.getAttribute("title") == title && (a.disabled != false || disabling))
        {
//            alert("enabling " + a.outerHTML + "\na.disabled: " + a.disabled + "\ntitle" + title);
            //If disabling a different link, then other links must be first enabled and then disabled, probably a bug in IE
            a.disabled = disabling;
            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);