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);