// stylesheet.js - Functions for toggling the active style sheet
// NOTE: some functions depend on cookie.js

function setActiveStylesheet (title)
{
    var links = document.getElementsByTagName("link");
    var index = 0;

    for(index = 0; index < links.length; index++)
    {
        if(links[index].getAttribute("rel").indexOf("style") != -1 && links[index].getAttribute("title"))
        {
            if(links[index].getAttribute("title") == title)
                links[index].disabled = false;
            else
                links[index].disabled = true;
        }
    }
}

function getActiveStylesheet ()
{
    var links = document.getElementsByTagName("link");
    var index = 0;

    for(index = 0; index < links.length; index++)
    {
        if(links[index].getAttribute("rel").indexOf("style") != -1 && links[index].getAttribute("title"))
        {
            if(links[index].disabled == false)
                return links[index].getAttribute("title");
        }
    }
    return null;
}

function getPreferredStylesheet ()
{
    var links = document.getElementsByTagName("link");
    var index = 0;

    for(index = 0; index < links.length; index++)
    {
        if(links[index].getAttribute("rel").indexOf("style") != -1 && links[index].getAttribute("title"))
        {
            if(links[index].getAttribute("rel").indexOf("alt") == -1)
                return links[index].title;
        }        
    }
}

function _stylesheet_js_window_onload (e)
{
    var stylesheet;

    _stylesheet_js_def_window_onload(e);

    setActiveStylesheet(getPreferredStylesheet());

    stylesheet = getPreferredStylesheet();

    try
    {
        stylesheet = (getCookie("stylesheet") ? getCookie("stylesheet") : getPreferredStylesheet());
    }
    catch(e)
    {
        stylesheet = getPreferredStylesheet();
    }

    setActiveStylesheet(stylesheet);
}

function _stylesheet_js_window_onunload (e)
{
    _stylesheet_js_def_window_onunload(e);

    try
    {
        setCookie("stylesheet", getActiveStylesheet(), 365, "/");
    }
    catch(e)
    {
    }
}

var _stylesheet_js_def_window_onload = function (e) { return; }
var _stylesheet_js_def_window_onunload = function (e) { return; }


if(window.onload)
    _stylesheet_js_def_window_onload = window.onload;

if(window.onunload)
    _stylesheet_js_def_window_onunload = window.onunload;

window.onload = _stylesheet_js_window_onload;
window.onunload = _stylesheet_js_window_onunload;