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;     
      }     
    }     
}     
   
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;     
}     
   
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;     
}     
   
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);