How do I call up the login required prompt from java

[Disco_Stu]

Can someone please tell me what function I would execute to display the standard prompt to require the user to login or register? I want to call this from a javascript function in an html forum block.

The display I want to use is the message box with the normal system message:

You are not logged in or you do not have permission to access this page. This could be due to one of several reasons:

You are not logged in. Fill in the form at the bottom of this page and try again.
You may not have sufficient privileges to access this page. Are you trying to edit someone else's post, access administrative features or some other privileged system?
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Thanks.