[OpenLayers-Users] Turn off BaseLayer?

[djs7743 at att.net]

Is it possible in OL to turn off the BaseLayer? In other words I'd like all my layers to be overlays. Looking at it another way, this would allow me to turn off all layers and just have a blank map. I'd also like to have the "Base Layer" portion of the LayerSwitcher disappear if all my layers are Overlays.

-Darrin
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