Pastable version of Simple jQuery script - Optimisation

<pre class='prettyprint' language='javascript'>$(document).ready(function(){
  $('#nav_menu_1').before('&lt;a id=&quot;open_all&quot; class=&quot;&quot; href=&quot;#&quot;&gt;Screen reader users can click here to open all menus&lt;/a&gt;');
  $(&quot;#menu_column ul li&quot;).not(&quot;#menu_column ul li ul li&quot;).each(function(){
        checkCookie(this);    
    });
    
    function checkCookie(li) {
        var menu_index = $(li).index();
        var menu_id = $(li).parent().parent().attr('id');
        var cookie_state = $.cookie(menu_id + '_' + menu_index);
        
        if(cookie_state === null || cookie_state === '0') {
            $('ul', li).slideUp('fast');
            $(&quot;a&quot;, li).not(&quot;#menu_column ul li ul li a&quot;).addClass('closed'); // Add class of closed to top level headings to add rounded corners
            $(&quot;span&quot;, li).addClass('closed'); // Add class of closed to top level headings to add rounded corners
            if ($(li).children('ul').length) {
                $(li).children('a, span').before('&lt;div class=&quot;toggle nav_arrow_light_down&quot;&gt;&lt;/div&gt;');
             } 
            else {
                $(li).not(&quot;#menu_column ul li ul li&quot;).addClass('no_toggle'); // If no children add no_toggle class
            }
        };
        
        if(cookie_state === '1') {
            $(li).children('a, span').before('&lt;div class=&quot;toggle nav_arrow_light_up&quot;&gt;&lt;/div&gt;');
        };
    }
	
	 $('#menu_column #open_all').click(function(){ // For screen reader users - Opens all menus
        $('#menu_column .toggle').each(function(){
            if($(this).hasClass('nav_arrow_light_down')){
                $(this).siblings('ul').slideDown('fast');
                $(this).removeClass('nav_arrow_light_down');
                $(this).addClass('nav_arrow_light_up');
                $(this).next().removeClass(&quot;closed&quot;);
				changeCookie(this)
            }
        });
    });
    
    function changeCookie(toggle) {
        if($(toggle).hasClass('nav_arrow_light_down')){
                var menu_index = $(toggle).parent().index();
                var menu_id = $(toggle).parent().parent().parent().attr('id');
                $.cookie(menu_id + '_' + menu_index, '0', { path: '/' })
            }else{
                var menu_index = $(toggle).parent().index();
                var menu_id = $(toggle).parent().parent().parent().attr('id');
                $.cookie(menu_id + '_' + menu_index, '1', { path: '/' });
            }
    }
    
     $('.toggle').click(function(){
        $(this).siblings('ul').slideToggle(300);
        $(this).next().toggleClass('closed');
        $(this).toggleClass('nav_arrow_light_up');
        $(this).toggleClass('nav_arrow_light_down');
        changeCookie(this);
        return false
     });
    
});</pre>
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Pastable version of Simple jQuery script - Optimisation