function setColor(title) {
    setActiveStyleSheet('color', title);
}

function setFontSize(direction) {
    var currentFontStyle = getActiveStyleSheet("fontsize");
    if (currentFontStyle == null) currentFontStyle = "fontsize_0";
    var idx = currentFontStyle.indexOf("fontsize");
    var newFontStyle = "fontsize_0";
    var currentFontSize = 0;
    try{
        currentFontSize = currentFontStyle.replace("fontsize_", "");
    }
    catch(err) {
        currentFontSize = 0;
    }

    if (direction == "smaller") {
        if (currentFontSize > 0)
            currentFontSize--;
    }
    else {
        if (currentFontSize < 3)
            currentFontSize++;
    }

    newFontStyle = "fontsize_" + currentFontSize;
    setActiveStyleSheet('fontsize', newFontStyle);
}

function resetStyle() {
    //setActiveStyleSheet('color', 'color_black_white');
    //setActiveStyleSheet('fontsize', 'fontsize_0');
    setActiveStyleSheet('color', '');
    setActiveStyleSheet('fontsize', 'fontsize_0');
}

function setActiveStyleSheet(prefix, title) {
    var i, a, main;
    for (i = 0; (a = document.getElementsByTagName("link")[i]); i++) {
        if (a.getAttribute("title") != null)
        {
            if (a.getAttribute("rel").indexOf("style") != -1 && a.getAttribute("title").indexOf(prefix + "_") == 0) {
                a.disabled = true;
                if (a.getAttribute("title") == title) a.disabled = false;
            }
        }
    }
}

function getActiveStyleSheet(prefix) {
    var i, a;
    for (i = 0; (a = document.getElementsByTagName("link")[i]); i++) {
        if (a.getAttribute("title") != null) {
            if (a.getAttribute("rel").indexOf("style") != -1 && a.getAttribute("title").indexOf(prefix + "_") == 0 && !a.disabled) return a.getAttribute("title");
        }
    }
    return null;
}

function getPreferredStyleSheet(prefix) {a
    var i, a;
    for (i = 0; (a = document.getElementsByTagName("link")[i]); i++) {
        if (a.getAttribute("title") != null) {        
            if (a.getAttribute("rel").indexOf("style") != -1 && a.getAttribute("rel").indexOf("alt") == -1 && a.getAttribute("title").indexOf(prefix + "_") == 0) 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;
}

function fnLoad(cookieName, prefix) {
    var cookie = readCookie(cookieName);
    var title = (cookie != null || cookie != 'null') ? cookie : getPreferredStyleSheet(prefix);
    setActiveStyleSheet(prefix, title);
}

window.onload = function(e) {
    fnLoad("colorStyle", "color");
    fnLoad("fontStyle", "fontsize");
}

function fnUnload(cookieName, prefix) {
    var title = getActiveStyleSheet(prefix);
    createCookie(cookieName, title, 365);
}

window.onunload = function(e) {
    fnUnload("colorStyle", "color");
    fnUnload("fontStyle", "fontsize");
}

function readFromCookie(cookieName, prefix) {
    var cookie = readCookie(cookieName);
    var title = (cookie != null || cookie != 'null') ? cookie : getPreferredStyleSheet(prefix)
    setActiveStyleSheet(prefix, title);
}

readFromCookie("colorStyle", "color");
readFromCookie("fontStyle", "fontsize");