쿠키관련질문

<script type="text/javascript">

$(document).ready(function(){

    // Variables
    var objMain = $('#nav');

    // Show sidebar
    function showSidebar(){
        objMain.addClass('use-sidebar');
        $.cookie('sidebar-pref2', 'use-sidebar', { expires: 30 });
    }

    // Hide sidebar
    function hideSidebar(){
        objMain.removeClass('use-sidebar');
        $.cookie('sidebar-pref2', null, { expires: 30 });
    }

    // Sidebar separator
    var objSeparator = $('#separator');

    objSeparator.click(function(e){
        e.preventDefault();
        if ( objMain.hasClass('use-sidebar') ){
            hideSidebar();
        }
        else {
            showSidebar();
        }
    });

    // Load preference
    if ( $.cookie('sidebar-pref2') == null ){
        objMain.removeClass('use-sidebar');
    }
});

</script>