Userscripts.org

Nice script, thanks.
But you could add a check for 'menuTable' element presence (it is absent on 'showmessage' page and may be somewhere else).

I couldn't start buildings with your script enabled. The following code works better:

(function() {
var parent = document.getElementById('menuTable');
if (!parent) return;
var item = document.createElement('li');
item.className = 'menubutton_table';
item.innerHTML = '<a class="menubutton" href="pranger.php" target="_blank"><span class="textlabel">Pranger</span></a>';
parent.appendChild(item);
})()