diff --git a/lib/OpenLayers/Layer/Grid.js b/lib/OpenLayers/Layer/Grid.js
index d0a6d2d397..7b8e0e9424 100644
--- a/lib/OpenLayers/Layer/Grid.js
+++ b/lib/OpenLayers/Layer/Grid.js
@@ -4,14 +4,9 @@
 // @require: OpenLayers/Layer.js
 // @require: OpenLayers/Util.js
 OpenLayers.Layer.Grid = Class.create();
-OpenLayers.Layer.Grid.prototype = Object.extend( new OpenLayers.Layer(), {
+OpenLayers.Layer.Grid.prototype = 
+  Object.extend( new OpenLayers.Layer.HTTPRequest(), {
     
-    // str: url
-    url: null,
-
-    // hash: params
-    params: null,
-
     // tileSize: OpenLayers.Size
     tileSize: null,
     
@@ -30,23 +25,17 @@ OpenLayers.Layer.Grid.prototype = Object.extend( new OpenLayers.Layer(), {
     * @param {Object} options Hash of extra options to tag onto the layer
     */
     initialize: function(name, url, params, options) {
-        var newArguments = arguments;
-        if (arguments.length > 0) {
-            newArguments = [name, options];
-        }          
-        OpenLayers.Layer.prototype.initialize.apply(this, newArguments);
-        this.url = url;
-        this.params = params;
+        OpenLayers.Layer.HTTPRequest.prototype.initialize.apply(this, 
+                                                                arguments);
     },
 
     /**
      * 
      */
     destroy: function() {
-        this.params = null;
         this.clearGrid();
         this.grid = null;
-        OpenLayers.Layer.prototype.destroy.apply(this, arguments); 
+        OpenLayers.Layer.HTTPRequest.prototype.destroy.apply(this, arguments); 
     },
 
     /** When the layer is added to a map, then we can ask the map for
@@ -55,7 +44,7 @@ OpenLayers.Layer.Grid.prototype = Object.extend( new OpenLayers.Layer(), {
      * @param {OpenLayers.Map} map
      */
     setMap: function(map) {
-        OpenLayers.Layer.prototype.setMap.apply(this, arguments);
+        OpenLayers.Layer.HTTPRequest.prototype.setMap.apply(this, arguments);
         if (this.tileSize == null) {
             this.tileSize = this.map.getTileSize();
         }
@@ -243,40 +232,7 @@ OpenLayers.Layer.Grid.prototype = Object.extend( new OpenLayers.Layer(), {
             }
         }
     },
-    /** combine the ds's serverPath with its params and the tile's params. 
-    *   
-    *    does checking on the serverPath variable, allowing for cases when it 
-    *     is supplied with trailing ? or &, as well as cases where not. 
-    *
-    *    return in formatted string like this:
-    *        "server?key1=value1&key2=value2&key3=value3"
-    *
-    * @return {str}
-    */
-    getFullRequestString:function(params) {
-        var requestString = "";        
-        this.params.SRS = this.map.getProjection();
-        // concat tile params with layer params and convert to string
-        var allParams = Object.extend(this.params, params);
-        var paramsString = OpenLayers.Util.getParameterString(allParams);
 
-        var server = this.url;
-        var lastServerChar = server.charAt(server.length - 1);
-
-        if ((lastServerChar == "&") || (lastServerChar == "?")) {
-            requestString = server + paramsString;
-        } else {
-            if (server.indexOf('?') == -1) {
-                //serverPath has no ? -- add one
-                requestString = server + '?' + paramsString;
-            } else {
-                //serverPath contains ?, so must already have paramsString at the end
-                requestString = server + '&' + paramsString;
-            }
-        }
-        return requestString;
-    },
-    
     /** go through and remove all tiles from the grid, calling
     *    destroy() on each of them to kill circular references
     * 
@@ -310,15 +266,6 @@ OpenLayers.Layer.Grid.prototype = Object.extend( new OpenLayers.Layer(), {
         // Should be implemented by subclasses
     },
 
-    /**
-     * changeParams is designed to allow you to change the 
-     * parameters of a layer after it's created.
-     * @param {Object} params Hash of new params to use
-     */
-    changeParams:function(params) {
-        this.params = Object.extend(this.params, OpenLayers.Util.upperCaseObject(params));
-        this._initTiles();
-    },
     
     /** 
      * @returns Degrees per Pixel
diff --git a/lib/OpenLayers/Layer/WFS.js b/lib/OpenLayers/Layer/WFS.js
index 03c2928569..1a43dc7eee 100644
--- a/lib/OpenLayers/Layer/WFS.js
+++ b/lib/OpenLayers/Layer/WFS.js
@@ -117,6 +117,38 @@ OpenLayers.Layer.WFS.prototype =
     },
 
 
+
+    /**
+     * Catch changeParams and uppercase the new params to be merged in
+     *  before calling changeParams on the super class.
+     * 
+     * Once params have been changed, we will need to re-init our tiles
+     * 
+     * @param {Object} params Hash of new params to use
+     */
+    mergeNewParams:function(params) {
+        var upperParams = OpenLayers.Util.upperCaseObject(params);
+        var newArguments = [upperParams];
+        OpenLayers.Layer.Grid.prototype.mergeNewParams.apply(this, newArguments);
+
+        this._initTiles();
+    },
+
+    /** combine the layer's url with its params and these newParams. 
+    *   
+    *    Add the SRS parameter from getProjection() -- this is probably
+    *     more eloquently done via a setProjection() method, but this 
+    *     works for now and always.
+    * 
+    * @param {Object} newParams
+    * 
+    * @type String
+    */
+    getFullRequestString:function(newParams) {
+        this.params.SRS = this.map.getProjection();
+        return OpenLayers.Layer.Grid.prototype.getFullRequestString.apply(
+                                                    this, arguments);
+    },
     /** @final @type String */
     CLASS_NAME: "OpenLayers.Layer.WFS"
 }
diff --git a/lib/OpenLayers/Layer/WMS.js b/lib/OpenLayers/Layer/WMS.js
index b964ab3576..a1ae329080 100644
--- a/lib/OpenLayers/Layer/WMS.js
+++ b/lib/OpenLayers/Layer/WMS.js
@@ -89,6 +89,39 @@ OpenLayers.Layer.WMS.prototype =
                                              url, this.tileSize);
     },
 
+
+    /**
+     * Catch changeParams and uppercase the new params to be merged in
+     *  before calling changeParams on the super class.
+     * 
+     * Once params have been changed, we will need to re-init our tiles
+     * 
+     * @param {Object} params Hash of new params to use
+     */
+    mergeNewParams:function(params) {
+        var upperParams = OpenLayers.Util.upperCaseObject(params);
+        var newArguments = [upperParams];
+        OpenLayers.Layer.Grid.prototype.mergeNewParams.apply(this, newArguments);
+
+        this._initTiles();
+    },
+
+    /** combine the layer's url with its params and these newParams. 
+    *   
+    *    Add the SRS parameter from getProjection() -- this is probably
+    *     more eloquently done via a setProjection() method, but this 
+    *     works for now and always.
+    * 
+    * @param {Object} newParams
+    * 
+    * @type String
+    */
+    getFullRequestString:function(newParams) {
+        this.params.SRS = this.map.getProjection();
+        return OpenLayers.Layer.Grid.prototype.getFullRequestString.apply(
+                                                    this, arguments);
+    },
+    
     /** @final @type String */
     CLASS_NAME: "OpenLayers.Layer.WMS"
 });