Index: WMS.js
===================================================================
--- WMS.js	(revision 1217)
+++ WMS.js	(working copy)
@@ -48,7 +48,7 @@
                            );
         }
         
-        this.isBaseLayer = (this.params.TRANSPARENT != "true");
+        this.isBaseLayer = (params.TRANSPARENT != "true");
     },    
 
     /**