(function($) {
    $.fn.list_nav = function(b) {
        var c,
        item,
        httpadress;
        b = jquery.extend({
            speed: 220,
            autostart: 1,
            autohide: 1
        },
        b);
        c = $(this);
        item = c.children("ul").parent("li").children("a");
        httpadress = window.location;
        item.addclass("inactive");
        function _item() {
            var a = $(this);
            if (b.autohide) {
                a.parent().parent().find(".active").parent("li").children("ul").slideup(b.speed / 1.2, 
                function() {
                    $(this).parent("li").children("a").removeattr("class");
                    $(this).parent("li").children("a").attr("class", "inactive")
                })
            }
            if (a.attr("class") == "inactive") {
                a.parent("li").children("ul").slidedown(b.speed, 
                function() {
                    a.removeattr("class");
                    a.addclass("active")
                })
            }
            if (a.attr("class") == "active") {
                a.removeattr("class");
                a.addclass("inactive");
                a.parent("li").children("ul").slideup(b.speed)
            }
        }
        item.unbind('click').click(_item);
        if (b.autostart) {
            c.children("a").each(function() {
                if (this.href == httpadress) {
                    $(this).parent("li").parent("ul").slidedown(b.speed, 
                    function() {
                        $(this).parent("li").children(".inactive").removeattr("class");
                        $(this).parent("li").children("a").addclass("active")
                    })
                }
            })
        }
    }
})(jquery);


$(document).ready(function (){ 
  
  $(".list_nav ul li").list_nav();
  
});