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


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