RYM: Add Dropdown Menus (Fixed Toolbar)

see title
Versão de: 16/03/2015. Veja: a última versão.
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// ==UserScript==
// @name       RYM: Add Dropdown Menus (Fixed Toolbar)
// @version    1.0
// @description    see title
// @match      http://rateyourmusic.com/*
// @match      https://rateyourmusic.com/*
// @grant      GM_addStyle
// @require    http://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js 
// @namespace https://greasyfork.org/users/2625
// ==/UserScript==


$("#navtop").css('zIndex', 1); 

var communityMenu = '<li class="dropmenu">'; 
communityMenu += '<a href="/boards/board_id=1">Music</a><a href="/boards/board_id=9">Polls/Games/Surveys</a>'; 
communityMenu += '<a href="/boards/board_id=2">Site Board</a><a href="/boards/board_id=3">Film</a>'; 
communityMenu += '<a href="/boards/board_id=6">Off Topic</a>'; 
communityMenu += '<a href="/boards/board_id=9999">Video Games</a></li>'; 

var chartMenu = '<li class="dropmenu">'; 
chartMenu += '<a href="/customchart?chart_type=top&type=album&year=2015">2015 albums</a>'; 
chartMenu += '<a href="/customchart?chart_type=top&type=single&year=2015">2015 singles</a>'; 
chartMenu += '<a href="/films/chart">film charts</a>'; 
chartMenu += '<a href="/films/chart?year=2015">2015 films</a></li>'; 

$('#navtop li:nth-child(4)').addClass('topmenu').css('height', '30px').append(chartMenu); 
$('#navtop li:nth-child(5)').addClass('topmenu').css('height', '30px').append(communityMenu); 


GM_addStyle('li.topmenu li.dropmenu {  visibility: hidden; }'); 
GM_addStyle('li.dropmenu {  display: none; position: absolute; z-index: 1; font-size: 0.8em!important; background: #555!important; opacity:0.9;}'); 
GM_addStyle('li.topmenu:hover li.dropmenu {visibility: visible;}'); 

$("#navtop").css("position", "fixed");
$("#top").css("zIndex", 1); 
$("#top").css("position", "fixed"); 
$(".submenu_ext:eq(0)").before('<br><br>')