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);