/*
Onload
*/
window.onload = initCSS;
// initCSS: If there's a "mystyle" cookie, set the active stylesheet when the page loads
function initCSS() {
 var style = readCookie("mystyle");
 if (style) {
   activeCSS(style);
 }
}

/*
Switcher Function
*/
// activeCSS: Set the active stylesheet
function activeCSS(title) {
  var i, oneLink;
  for (i = 0; (oneLink = document.getElementsByTagName("link")[i]); i++) {
    if (oneLink.getAttribute("title") && findWord("stylesheet", oneLink.getAttribute("rel"))) {
      oneLink.disabled = true;
      if (oneLink.getAttribute("title") == title) {
        oneLink.disabled = false;
      }
    }
  }
   setCookie("mystyle", title, 365);
}

// findWord: Used to find a full word (needle) in a string (haystack)
function findWord(needle, haystack) {
  return haystack.match(needle + "\\b");
}

/*
Cookie function
*/
// Set the cookie 
function setCookie(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+";";
}

/*
Read the Cookie
*/
function readCookie(name) {
 var needle = name + "=";
 var cookieArray = document.cookie.split(';');
 for(var i=0;i < cookieArray.length;i++) {
   var pair = cookieArray[i];
   while (pair.charAt(0)==' ') {
     pair = pair.substring(1, pair.length);
   }
   if (pair.indexOf(needle) == 0) {
     return pair.substring(needle.length, pair.length);
   }
 }
 return null;
}