Edit your bookmarklet
You can use this form to create your own My.Rackspace bookmarklet for logging in with multiple accounts.
Since you'll have your own account IDs and usernames just enter your details into the form below. Enter your account ID and account names in CSV format like the example shown in the form. The next page will display details on how to use the bookmarklet.
See blog post: Multiple accounts for My.Rackspace.com