function mainmenu() {
    $(" #nav ul ").css({ display: "none" }); // Opera Fix
    $(" #nav li").hover(function() {
        $(this).find('ul:first:hidden').css({ visibility: "visible", display: "none" }).show(400);
    }, function() {
        $(this).find('ul:first').css({ visibility: "hidden", display: "none" });
    });
}

$(document).ready(function() {
    mainmenu();
});

function nav() {
    var w = document.getElementById("country").selectedIndex;
    var url_add = document.getElementById("country").options[w].value;
    window.location.href = url_add;
}