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){
if (!document.getElementsByTagName) return;
var cookie=readCookie("style");
var title=cookie ? cookie : getPreferredStyleSheet();
setActiveStyleSheet(title);
}

window.onunload=function(e){
if(location.href.indexOf('farben.html')!=-1){
var title=getActiveStyleSheet();
createCookie("style", title, 3650);
}}