use this one:
http://www.jeezopeezo.com/admin/index.php?errorsall
the & is used to add more get-variables into the URL. The first one is called with ?, sorry for missing that.
Usually you already have a get-string in admin area
http://www.jeezopeezo.com/admin/index.php?view=images for example, and there you add the errors thing with '&' (without quotes).
So if there are no get-variables in the string (view=images), add the errors or errorsall with ?, otherwise with &