TYPO3 Core

if a normal user tries to switch workspaces, he gets the following error output:

"Object required"

When running ms js debugger, he lines out the following:

In typo3/contrib/prototype/prototype.js

Marked code:

pointer: function(event) {
      return {
        x: event.pageX || (event.clientX +
          (document.documentElement.scrollLeft || document.body.scrollLeft)),
        y: event.pageY || (event.clientY +
          (document.documentElement.scrollTop || document.body.scrollTop))
      };
    },

When closing the debugger, there are like 10 class/id/blah errors, that one needs to press no to warnings

1. login as a normal user (redakteur whatever...) using internet explorer 8
2. try to switch workspaces by the dropdown on top of the backend.

(issue imported from #M12901)