I am running OL2.5 and have a requirement to adjust the visibility or transparency of certain layers depending on whether or not a certain layer is selected in the LayerSwitcher. For example I have the base layer and layers 1,2 and 3. Layers 1 and 2 are visible when the page loads, 3 is not. When layer 3 is selected in the LayerSwitcher then layer 1 should be not visible (and deselected in the LayerSwitcher) and layer 2 should have the transparency set to .40. If layer 3 is deselected then layer 1 should then be selected and visible with layer 2's transparency reset to 1.0. Any help in doing all that would be greatly appreciated.
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