ANNOTATION only for an extent?

[James Net]

I am using several high quality aerial photographs, and each is copyright by 
someone different. How do I display different "copyright" statements only 
when viewing a certain extent?

I tried the following, but it displays the copyright statement whenever the 
zoom level reaches 50,000. These layers MUST be in the same group, else I 
would have made separate map files. So that when the user zoms in, they get 
to see more detail.

Any ideas?

My map file:

   LAYER
      NAME     "marble"
      GROUP    "mosaic"
      TYPE     RASTER
      STATUS   ON
      MINSCALE 4000000.0
      MAXSCALE 40000000.0
      CONNECTION     "http://wms.jpl.nasa.gov/wms.cgi?"
      CONNECTIONTYPE WMS
      METADATA
         wms_title            "marble"
         wms_srs              "EPSG:4326"
         wms_abstract         "NASA's next blue marble"
         "wms_srs"            "EPSG:4326"
         "wms_name"           "BMNG"
         "wms_server_version" "1.1.1"
         "wms_format"         "image/jpeg"
      END
   END

   LAYER
      NAME        "abc"
      GROUP       "mosaic"
      DATA        "abc.ECW"
      TYPE        RASTER
      STATUS      OFF
      MAXSCALE    50000.0
      TRANSPARENCY ALPHA
      OFFSITE     255 255 255
      PROJECTION
         "init=epsg:28355"
      END
      METADATA
         wms_title            "abc"
         wms_srs              "EPSG:28355"
         wms_abstract         "abc"
         wms_opaque           "1" # Hint to the client
      END
   END

   LAYER
      NAME        "xyz"
      GROUP       "mosaic"
      DATA        "xyz.ecw"
      TYPE        RASTER
      STATUS      OFF
      MAXSCALE    50000.0
      TRANSPARENCY ALPHA
      OFFSITE     255 255 255
      PROJECTION
         "init=epsg:28355"
      END
      METADATA
         wms_title            "xyz"
         wms_srs              "EPSG:28355"
         wms_abstract         "xyz"
         wms_opaque           "1" # Hint to the client
      END
   END

   LAYER
      NAME     "credits"
      TYPE     ANNOTATION
      STATUS   DEFAULT
      REQUIRES "[abc]"
      POSTLABELCACHE TRUE
      TRANSFORM      FALSE
      FEATURE
         POINTS
            0 15 # This is the position of the text in image coordinates 
(pixel).
         END
         TEXT 'Copyright abc'
      END
      CLASS
         LABEL
            ANTIALIAS true
            FONT      "sans"
            COLOR     255 0 0
            BACKGROUNDCOLOR 2 2 2
            POSITION UR
         END
      END
   END

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