[OpenLayers-Users] overlay layers masking baselayers issue?

[runningcodez]

Hi list,

I have a very strange issue with my application.I have 4 base layers of
google and another 7 no of overlay layers.I have arranged my baselayers in a
tree structure  with checkbox for each overlay layer which is mean to
display/hide corresponding overlay layer with check/uncheck of the
corresponding checkboxes.So far Firefox is working fine as desired.But  in
IE,the overlay layer  completely masks the baselayers beneath and acts as if
it is a baselayer.I couldnt find a solution.But I guess the key might be
some config option change.Any help is deeply appreciated. I am pasting the
snippets of codes.

This is how I add base layers.
yahSAT = new OpenLayers.Layer.Yahoo("Yahoo Sattelite",{'type':
YAHOO_MAP_SAT,'sphericalMercator':spMerc,minZoomLevel:minizoom,maxZoomLevels:maxzoom},{isBaseLayer:true,buffer:0});
                gooPHY = new OpenLayers.Layer.Google("GoogleMap",{type:
G_PHYSICAL_MAP,'sphericalMercator':
true,minZoomLevel:minizoom,maxZoomLevels:maxzoom},{isBaseLayer: true,buffer:
1});
                gooSTR = new OpenLayers.Layer.Google("Google
Streets",{sphericalMercator:spMerc,minZoomLevel:minizoom,maxZoomLevels:maxzoom},{isBaseLayer:
true,buffer: 0});
                gooHYB = new OpenLayers.Layer.Google("GoogleHyb",{type:
G_HYBRID_MAP,
sphericalMercator:spMerc,minZoomLevel:minizoom,maxZoomLevels:maxzoom},{isBaseLayer:true,buffer:0});
                gooSAT = new OpenLayers.Layer.Google("GoogleSat",{type:
G_SATELLITE_MAP,sphericalMercator:spMerc,minZoomLevel:minizoom,maxZoomLevels:maxzoom},{isBaseLayer:true,buffer:0});

		map.addLayers([yahSAT,gooPHY,gooSTR,gooHYB,gooSAT]);

And here is a couple of overlay layers

layer12 = new OpenLayers.Layer.WMS(
		    "ibin:eg_roads",
		    "http://localhost/geoserver/wms",
		    {layers:'ibin:eg_roads',height:'550',styles:'',width:
'350',srs:'EPSG:4326',format: format,transparent :true},//tiled:
'true',//tilesOrigin : "8089099.95,853577.878125"          
		    {'opacity': 1,isBaseLayer: false,singleTile: true, ratio: 1} 
                );
                layer12.setVisibility(0);
                layer13 = new OpenLayers.Layer.WMS(
		    "ibin:eg_grids3785",
		    "http://localhost/geoserver/wms",
		    {layers:'ibin:eg_grids3785',height:'550',styles:'',width:
'350',srs:'EPSG:900913',format: format,transparent :true},//tiled:
'true',//tilesOrigin : "8089099.95,853577.878125"          
		    {opacity: 1,isBaseLayer: false,singleTile: true, ratio: 1} 
                );
                layer13.setVisibility(1);

Thanks in advanec.
regards
Sumith
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