My approach is to specify an invalid WMS layer.
var blank = new OpenLayers.Layer.WMS('Blank',
"/cgi-bin/mapserv", {layers:'blank', format:'image/png'},
{isBaseLayer:true, displayOutsideMaxExtent:true }
);
map.addLayer(blank);
// now add nothing but overlays
This does generate the pink boxes, but I always suppress those anyway.
OpenLayers.Util.onImageLoadError = function() { };
--
Gregor Mosheh / Greg Allensworth, BS, A+
System Administrator
HostGIS cartographic development & hosting services
http://www.HostGIS.com/
"Remember that no one cares if you can back up,
only if you can restore." - AMANDA
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