[Zope] not authorised to access this resource

[Matt Carey]

sorry if this is a simple question...

i have some restricted folders in a zope site and i'm using acl_users 
and roles to control access.

when the username and password box comes up and someone hits cancel, 
zope(?) generates the following line of text:

you are not authorised to access this resource.
username and password are not correct.

my problem is the code it generates:

<strong>you are not authorised to access this resource.</strong><p>
username and password are not correct.

the text is fine, but when it goes into my dtml page it is playing 
havoc with my layout and css. where can i find this error message so i 
can amend the html tags?

cheers
matt