[mapserver-users] Overriding MapServer Map File Parameters in OpenLayers

[Bill Thoen]

I'm trying to make a map in OpenLayers 2.7 using a MapServer 5.0.3 Map 
File, and I'm trying to change the Layer color from what's specified in 
the Map File. In OpenLayers, I have to format the parameter as a key: 
value pair. So here's what I've tried (without success) in my OL javascript:

var baseLayer = new OpenLayers.Layer.MapServer( "USA",
  "http://206.168.217.244/cgi-bin/mapserv?",
  {
   map_imagetype: 'PNG',
   layer: 'states',
   map_layer_0_class_0_style_0_color: '255+255+000',
   map: '/var/www/html/piper/usa.map'
   }, { singleTile: true });

If I take out this line:
map_layer_0_class_0_style_0_color: '255+255+000'
the map works fine. The only layer in the map is the US states, and all 
I want to do is change the color from pale yellow as set in the map file 
to bright yellow.

The relevant part of the map file looks like this:
   LAYER
      NAME "states"
      TYPE POLYGON
      DATA states
      CLASS
         NAME "US States"
         STYLE
            OUTLINECOLOR 100 100 100
            COLOR 255 255 192
         END
      END
      PROJECTION
         "init=epsg:32614" # UTM Zone 14 N WGS84
      END
      STATUS DEFAULT
   END

I think the problem is that I've got the syntax wrong in trying to 
override the MapServer map file parameter. I've looked at 
http://mapserver.osgeo.org/cgi/controls.html#changing-map-file-parameters-via-a-form-or-a-url 
but that hasn't helped. So does anyone *here* know how to do this? (I 
was told on the OpenLayers mailing list to try asking on the MapServer 
list.)

TIA,
- Bill Thoen