var CurrentSize = 1;
var stylesheet = '_css/StyleSheet.css';

function CheckForCookie() {
    // On Pageload, it checks for existing cookies for Font Size
    if (Get_Cookie('ifbtFontSize')) {
        CurrentSize = parseInt(Get_Cookie('ifbtFontSize'));
        SetStyleSheet();
    }
    else {
        SetStyleSheet();
        Set_Cookie('ifbtFontSize', CurrentSize, 365, '/', '', '');
    }
}

function ChangeFontSize(size) {
    CurrentSize = size;
    SetStyleSheet();
}

function SetStyleSheet() {
    if (CurrentSize == 1) {
        stylesheet = '_css/StyleSheet_Small.css';
    }
    else if (CurrentSize == 2) {
        stylesheet = '_css/StyleSheet_Medium.css';
    }
    else if (CurrentSize == 3) {
        stylesheet = '_css/StyleSheet_Large.css';
    }
    else {
        CurrentSize = 1;
        stylesheet = '_css/StyleSheet_Small.css';
    }
    var headID = document.getElementsByTagName("head")[0];
    var cssNode = document.createElement('link');
    cssNode.type = 'text/css';
    cssNode.rel = 'stylesheet';
    cssNode.href = stylesheet;
    cssNode.media = 'screen';
    headID.appendChild(cssNode);
    Set_Cookie('ifbtFontSize', CurrentSize, 365, '/', '', '');
}

function Set_Cookie(name, value, expires, path, domain, secure) {
    // set time, it's in milliseconds
    var today = new Date();
    today.setTime(today.getTime());

    /*
    if the expires variable is set, make the correct
    expires time, the current script below will set
    it for x number of days, to make it for hours,
    delete * 24, for minutes, delete * 60 * 24
    */
    if (expires) {
        expires = expires * 1000 * 60 * 60 * 24;
    }
    var expires_date = new Date(today.getTime() + (expires));

    document.cookie = name + "=" + escape(value) +
((expires) ? ";expires=" + expires_date.toGMTString() : "") +
((path) ? ";path=" + path : "") +
((domain) ? ";domain=" + domain : "") +
((secure) ? ";secure" : "");
}

function Get_Cookie(check_name) {
    // first we'll split this cookie up into name/value pairs
    // note: document.cookie only returns name=value, not the other components
    var a_all_cookies = document.cookie.split(';');
    var a_temp_cookie = '';
    var cookie_name = '';
    var cookie_value = '';
    var b_cookie_found = false; // set boolean t/f default f

    for (i = 0; i < a_all_cookies.length; i++) {
        // now we'll split apart each name=value pair
        a_temp_cookie = a_all_cookies[i].split('=');


        // and trim left/right whitespace while we're at it
        cookie_name = a_temp_cookie[0].replace(/^\s+|\s+$/g, '');

        // if the extracted name matches passed check_name
        if (cookie_name == check_name) {
            b_cookie_found = true;
            // we need to handle case where cookie has no value but exists (no = sign, that is):
            if (a_temp_cookie.length > 1) {
                cookie_value = unescape(a_temp_cookie[1].replace(/^\s+|\s+$/g, ''));
            }
            // note that in cases where cookie is initialized but no value, null is returned
            return cookie_value;
            break;
        }
        a_temp_cookie = null;
        cookie_name = '';
    }
    if (!b_cookie_found) {
        return null;
    }
}