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.onunload = function(e) {
  var title = getActiveStyleSheet();  
  createCookie("style", title, 365);
}

var cookie = readCookie("style");
var title = cookie ? cookie : getPreferredStyleSheet();
setActiveStyleSheet(title);