[TYPO3-english] Pagetree not working properly

[Bartbogdan]

Hello all,

The pagetree in the backend of our typo3 installation is not working properly.
Clicking the plus sign does not expand a branch, also the contextual 
icon menu is not working.
Javascript throws the following errors:
Can't find variable: Tree
Can't find variable: Clickmenu
Can't find variable: showClickmenu
Can't find variable: DragDrop
Can't find variable: Prototype

I have filed a bug at http://bugs.typo3.org/view.php?id=11067

Best regards,

Bart