function fontsizeup() {
    active = getActiveStyleSheet();
    switch (active) {
        case 'A--':
            setActiveStyleSheet('A-');
            break;
        case 'A-':
            setActiveStyleSheet('A');
            break;
        case 'A':
            setActiveStyleSheet('A+');
            break;
        case 'A+':
            setActiveStyleSheet('A++');
            break;
        case 'A++':
            break;
        default:
            setActiveStyleSheet('A');
            break;
    }
}

function fontsizedown() {
    active = getActiveStyleSheet();
    switch (active) {
        case 'A++':
            setActiveStyleSheet('A+');
            break;
        case 'A+':
            setActiveStyleSheet('A');
            break;
        case 'A':
            setActiveStyleSheet('A-');
            break;
        case 'A-':
            setActiveStyleSheet('A--');
            break;
        case 'A--':
            break;
        default:
            setActiveStyleSheet('A--');
            break;
    }
}

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;
        }
    }
    $("#size_dropdown").val(title);
}

function ddlSetActiveStyleSheet() {
    var i, a, main, title;
    title = $("#size_dropdown").val();
    createCookie('_ISCStyle', title, 365);
    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() {
    return ('A-');
}

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 setCookieStyleSheet() {
    var cookie = readCookie("_ISCStyle");
    var title = cookie ? cookie : getPreferredStyleSheet();
    setActiveStyleSheet(title);
}