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);