$(function() {
    var body = $('body');
    var changeBtnClickHd = function(e) {
        var ele = e.target;
        var newClassName = "";
        switch (ele.id) {
            case 'font_change1':
                newClassName = "font_size_max";
                break;
            case 'font_change2':
                newClassName = "font_size_middle";
                break;
            case 'font_change3':
                newClassName = "font_size_min";
                break;
            default: break;
        }
        body.removeClass(body.attr('class'));
        body.addClass(newClassName);
        $.cookie('default_font_size', newClassName, { expires: 30 });
    };
    $('#font_change1').click(changeBtnClickHd).css('cursor', 'pointer');
    $('#font_change2').click(changeBtnClickHd).css('cursor', 'pointer');
    $('#font_change3').click(changeBtnClickHd).css('cursor', 'pointer');
    
    var ck = $.cookie('default_font_size');
    if (ck == null) {
        return;
    }
    body.removeClass(body.attr('class'));
    body.addClass(ck);
});