$(function(){
    var divMdown, sel = false;
    
    $("ul.menu > li").hover(function(){
        sel = $('> a[class~=selected]', this);
        divMdown = $('div.m-down', this);
            if(divMdown.length > 0){
                $('> a', this).addClass('selected');
                $('> a', this).addClass('lev2');
                divMdown.addClass('on');
                divMdown.css({visibility: "visible"}).show(200);
            }
    }, function(){
        $('> a', this).removeClass('lev2');
        divMdown.removeClass('on');
        divMdown.css({visibility: "hidden"}).hide();
            if(!sel.length){$('> a', this).removeClass('selected');}
    });

});