var mainNav = function() {

    var main = {
        obj_nav :   $(arguments[0]) || $("nav"),

        settings :  {
            show_delay      :   0,
            hide_delay      :   0,
            _ie6            :   /MSIE 6.+Win/.test(navigator.userAgent),
            _ie7            :   /MSIE 7.+Win/.test(navigator.userAgent)
        },

        init :  function(obj, level) {
            obj.lists = obj.childElements();
            obj.lists.each(function(el,ind){
                main.handlNavElement(el);
                if((main.settings._ie6 || main.settings._ie7) && level){
                    main.ieFixZIndex(el, ind, obj.lists.size());
                }
            });
            if(main.settings._ie6 && !level){
                document.execCommand("BackgroundImageCache", false, true);
            }
        },

        handlNavElement :   function(list) {
            if(list !== undefined){
                list.onmouseover = function(){
                    main.fireNavEvent(this,true);
                };
                list.onmouseout = function(){
                    main.fireNavEvent(this,false);
                };
                if(list.down("ul")){
                    main.init(list.down("ul"), true);
                }
            }
        },

        ieFixZIndex : function(el, i, l) {
            if(el.tagName.toString().toLowerCase().indexOf("iframe") == -1){
                el.style.zIndex = l - i;
            } else {
                el.onmouseover = "null";
                el.onmouseout = "null";
            }
        },

        fireNavEvent :  function(elm,ev) {
            if(ev){
                elm.addClassName("over");
                elm.down("a").addClassName("over");
                if (elm.childElements()[1]) {
                    main.show(elm.childElements()[1]);
                }
            } else {
                elm.removeClassName("over");
                elm.down("a").removeClassName("over");
                if (elm.childElements()[1]) {
                    main.hide(elm.childElements()[1]);
                }
            }
        },

        show : function (sub_elm) {
            if (sub_elm.hide_time_id) {
                clearTimeout(sub_elm.hide_time_id);
            }
            sub_elm.show_time_id = setTimeout(function() {
                if (!sub_elm.hasClassName("shown-sub")) {
                    sub_elm.addClassName("shown-sub");
                }
            }, main.settings.show_delay);
        },

        hide : function (sub_elm) {
            if (sub_elm.show_time_id) {
                clearTimeout(sub_elm.show_time_id);
            }
            sub_elm.hide_time_id = setTimeout(function(){
                if (sub_elm.hasClassName("shown-sub")) {
                    sub_elm.removeClassName("shown-sub");
                }
            }, main.settings.hide_delay);
        }

    };
    if (arguments[1]) {
        main.settings = Object.extend(main.settings, arguments[1]);
    }
    if (main.obj_nav) {
        main.init(main.obj_nav, false);
    }
};

document.observe("dom:loaded", function() {
    mainNav("nav", {"show_delay":"0","hide_delay":"0"});
});


$j(document).ready(function(){
	
	$j('a.level-top').attr('href', 'javascript:void(0);');
	var nbck = jQuery('<div id="menu-bg"></div>');
	nbck.appendTo('.header');
	
	$j('#nav, ul.link').mouseleave(function(){
		var all = $j('ul', 'li.level-top');
		all.stop(true,true).fadeOut(0,function(){
			$j('#menu-bg').stop().animate({height: 0 + 'px'},400);
		})
	})
	$j("#nav li.level-top, ul.link li.level-top").hoverIntent({
		sensitivity: 7, // number = sensitivity threshold (must be 1 or higher)
		interval: 250,   // number = milliseconds of polling interval
		over: showNav,  // function = onMouseOver callback (required)
		timeout: 0,   // number = milliseconds delay before onMouseOut function call
		out: hideNav    // function = onMouseOut callback (required)
	});
	function showNav(){
		var all = $j('ul', 'li.level-top');
		var drop = $j('ul', this);
		all.fadeOut(300)
		$j('#menu-bg').stop().animate({height: drop.outerHeight() + 'px'},190,function(){
			drop.stop(true,true).delay(100).fadeIn(150);
		})
	};
	function hideNav(){
		var all = $j('ul', 'li.level-top');
		all.stop(true,true).fadeOut(0);
	};
})