[OpenLayers-Users] sphericalMercator

[Armin Wäspy]

Hi everybody,
I'm new in openlayers and testing some WMS overlays.
 
I want to overlay a WMS over a google maps or yahoo map basic layer. 
As long i know gm or ym are in sphericalMercator EPSG:900913
so i set the wms an epsg: 900913
as you see here:
http://rips-uis.lubw.baden-wuerttemberg.de/wms/cgi/GDI_SCHUTZGEBIET_NATUR?REQUEST=GetCapabilities&SERVICE=WMS 
 
in my code are 2 wms layers. one with, one without EPSG:900913
the one without sends an error message "invalid SRS value" --> of course!
the one with correct EPSG don't show and no error messages
what's wrong?
can anybody help?
 
map:
http://rips-uis.lubw.baden-wuerttemberg.de/rips/wms_viewer/openlayer_test/myOpenLayer2.php 
 
code:
var map, gmap, layer1, layer2, layer3;
function init(){
            var options = {
                projection: "EPSG:900913",
                units: "m",
                maxResolution: 156543.0339,
                maxExtent: new OpenLayers.Bounds(-20037508, -20037508,
                                                 20037508, 20037508.34)
            };

            map = new OpenLayers.Map('map', options);
            map.addControl(new OpenLayers.Control.LayerSwitcher({'div':OpenLayers.Util.getElement('layerswitcher')}));
            map.addControl(new OpenLayers.Control.MousePosition());
 

            // create Google Mercator layers
            var gmap = new OpenLayers.Layer.Google(
                "Google Streets",
        {type: G_NORMAL_MAP, 'sphericalMercator': true}
            );
 
            map.addLayer(gmap);
        
 
//WMS-Layer       
            layer2 = new OpenLayers.Layer.WMS( "Naturraum", "http://rips-uis.lubw.baden-wuerttemberg.de/wms/cgi/UIS_0100000006900001", {layers: '0', transparent:'true'}, { 'isBaseLayer': false, 'opacity': 0.7 } );
            layer3 = new OpenLayers.Layer.WMS( "Naturschutz", "http://rips-uis.lubw.baden-wuerttemberg.de/wms/cgi/GDI_SCHUTZGEBIET_NATUR", {layers: '0,1,2,3,4', transparent:'true', 'sphericalMercator': true}, { 'isBaseLayer': false } );
            map.addLayers([layer2, layer3]);
 
      map.setCenter(new OpenLayers.LonLat(1015000, 6200000), 8);
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