function setActiveStyleSheet(title, reset) {
    if (!W3CDOM) { return false };
    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;
            }
        }
    }
    if (reset == 1) {
        createCookie("wstyle", title, 365);
    }
};

var bugRiddenCrashPronePieceOfJunk = (
    navigator.userAgent.indexOf('MSIE 5') != -1
    &&
    navigator.userAgent.indexOf('Mac') != -1
)

var W3CDOM = (!bugRiddenCrashPronePieceOfJunk &&
               document.getElementsByTagName &&
               document.createElement);


function setStyle() {

    var style = readCookie("wstyle");
    if (style != null) {
        setActiveStyleSheet(style, 0);
    }
};
registerPloneFunction(setStyle);

function registerPloneFunction(func) {
    registerEventListener(window, "load", func);
}


function registerEventListener(elem, event, func) {
    if (elem.addEventListener) {
        elem.addEventListener(event, func, false);
        return true;
    } else if (elem.attachEvent) {
        var result = elem.attachEvent("on" + event, func);
        return result;
    }

    return false;
}


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 + "=" + escape(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 unescape(c.substring(nameEQ.length, c.length));
        }
    }
    return null;
};