Confluence displays Javascript error messages in IE 7:

1. Create space. The error happens when space key exists already. The steps to reproduce:
   1. Create new space from dashboard.
   2. Fill in space key field with the key which has been existed in Confluence.
2. add member of the group.
   1. Go to Administration console -> Security -> Manage Groups -> <Click one of the group> -> Add Members
   2. Click Search icon.

Please have a look at the attachment for better description