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);