improved theme selection mechanism: don't force display:block on every themable element.

home.html

@@ -472,7 +472,7 @@
         <!-- ÁREA DE POSTS INIT -->
           <div class="postboard">
             <h2>
-              <span class="selectable_theme theme_original">Posts</span>
+              <span class="selectable_theme theme_original theme_calm">Posts</span>
               <!-- o botão de novas postagens deve ser ocultado quando o usuário clicá-lo via javascript -->
               <button class="postboard-news" style="display:none;"></button>
             </h2>

js/interface_common.js

@@ -1232,8 +1232,8 @@ function changeStyle() {
     }
     $('#stylecss').attr('href', style);
     $('#profilecss').attr('href', profile);
-    $("<style type='text/css'> .selectable_theme{display:none!important;}\n" +
-       ".theme_" + theme + "{display:block!important;}</style>").appendTo("head");
+    $("<style type='text/css'> .selectable_theme:not(.theme_" + theme + ")" +
+      "{display:none!important;}\n</style>").appendTo("head");
     setTimeout(function(){$(menu).removeAttr('style')}, 0);
 }