function loginMenuMouseOver(){    
    $(this).stop().animate({backgroundPosition: "0px 0px"}, 500);
}

function loginMenuMouseOut(){
    $(this).stop().animate({backgroundPosition: "400px 0px"}, 500);
}

function menuMouseOver(){
    $(this).addClass("menu_mouseover");
}

function menuMouseOut(){
    $(this).removeClass("menu_mouseover");
}
$(document).ready(function(){
    $("#menu_login").find("li").hover(loginMenuMouseOver, loginMenuMouseOut);
    $("#topo_menu").find("li").hover(menuMouseOver, menuMouseOut);
    $(".menu_carrossel").find("li").hover(menuMouseOver, menuMouseOut);
});