[OpenLayers-Users] Scale dependent layer problems

[mcpiper]

Hi, I'm just putting together my first OL map and have run into a problem.
The map is using Bing maps for the base and several WMS overlays. I'm trying
to make a layer scale dependent with no success and have been through all
the tips I could find in the forums. I'm obviously missing something and am
questioning whether I've configured the resolutions and extents correctly
also. Here is the relevant code:

//Configure map
	var options = {
		projection: new OpenLayers.Projection("EPSG:900913"),
		units: "m",
		resolutions: [156543.03390625, 78271.516953125, 39135.7584765625,
19567.87923828125, 9783.939619140625, 4891.9698095703125,
2445.9849047851562, 1222.9924523925781, 611.4962261962891,
305.74811309814453, 152.87405654907226, 76.43702827453613,
38.218514137268066, 19.109257068634033, 9.554628534317017,
4.777314267158508, 2.388657133579254, 1.194328566789627, 0.5971642833948135,
0.29858214169740677, 0.14929107084870338, 0.07464553542435169,
0.037322767712175846, 0.018661383856087923, 0.009330691928043961,
0.004665345964021981],
		maxExtent: new OpenLayers.Bounds(-20037508.34, -20037508.34, 20037508.34,
20037508.34),
		restrictedExtent: new OpenLayers.Bounds(-8903840, 5281647, -8788370,
5362210)
	};

...

var watercourses2 = new OpenLayers.Layer.WMS(
	"Watercourses",
	"http://gis.npca.ca/geoserver/gwc/service/wms?",
	{
		layers: 'floodmapping:watercourses_2k',
		transparent: 'true',
		resolutions: [0.07464553542435169, 0.037322767712175846,
0.018661383856087923,      0.009330691928043961, 0.004665345964021981],
		displayProjection: new OpenLayers.Projection("EPSG:4326"),
		isBaseLayer: false
	});

I appreciate any help I can get, and I'm a newb so be gentle!
mcpiper
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