Thread:Project:Support desk/Submenu left navigation (with triangle)

Hello, I am starting with wiki (wiki.spieringshoek.nl) for now i have on the left a kind of menu structure, but its to big (not for now but wil be later) I see on this site that its possible for soms submenu's (with the triangle) I have found an extension solution (TreeAndMenu) but that is not the same Can you please inform me how i can implent this I am running on the latest version of MediaWiki on Ubuntu server Thanks in advanced Eric from Holland