make the same change as in r1209 to wms-untiled. make baselayeredness based on transparency (as it was before)

git-svn-id: http://svn.openlayers.org/trunk/openlayers@1226 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/OpenLayers/Layer/WMS/Untiled.js

@@ -22,10 +22,8 @@ OpenLayers.Layer.WMS.Untiled.prototype =
                      },
 
     
-    /** WMS.Untiled layer is never a base layer. 
-     * @type Boolean
-     */
-    isBaseLayer: false,
+    /** @type Boolean */
+    isBaseLayer: null,
     
     /** @type DOMElement */
     imgDiv: null,
@@ -54,6 +52,11 @@ OpenLayers.Layer.WMS.Untiled.prototype =
                            OpenLayers.Util.upperCaseObject(this.DEFAULT_PARAMS)
                            );
         }
+
+        // if the layer is transparent, it will be an overlay        
+        this.isBaseLayer = ((this.params.TRANSPARENT != "true") && 
+                            (this.params.TRANSPARENT != true));
+
     },    
 
     /**