Users.php

I was wondering if there is a way to add a check system to the users.php so that users are only allowed to edit users below their current level.
So Admin can Edit anyone, Editors can only edit below Editor, not other Editors, etc.

I have put in a plugin that allows me to give Editors access to Add/Edit/Delete users, but unfortunately it also gives Editors the ability to remove Admin.

Shouldn’t be too hard for someone who knows the core files to add a little bit of a check system.

Thanks in advance!