diff --git a/lib/OpenLayers/Layer/ArcIMS.js b/lib/OpenLayers/Layer/ArcIMS.js
index ddbb37d383..eb7dbc983c 100644
--- a/lib/OpenLayers/Layer/ArcIMS.js
+++ b/lib/OpenLayers/Layer/ArcIMS.js
@@ -206,8 +206,9 @@ OpenLayers.Layer.ArcIMS = OpenLayers.Class(OpenLayers.Layer.Grid, {
      * bounds - {<OpenLayers.Bounds>} A bounds representing the bbox for the
      *     request.
      * callback - {Function} Function to call when image url is retrieved.
+     * scope - {Object} The scope of the callback method.
      */
-    getURLasync: function(bounds, callback) {
+    getURLasync: function(bounds, callback, scope) {
         bounds = this.adjustBounds(bounds);
         
         // create an arcxml request to generate the image
@@ -236,7 +237,7 @@ OpenLayers.Layer.ArcIMS = OpenLayers.Class(OpenLayers.Layer.Grid, {
                 var axlResp = new OpenLayers.Format.ArcXML();
                 var arcxml = axlResp.read(doc);
                 
-                callback(this.getUrlOrImage(arcxml.image.output));
+                callback.call(scope, this.getUrlOrImage(arcxml.image.output));
             },
             scope: this
         });
diff --git a/lib/OpenLayers/Tile/Image.js b/lib/OpenLayers/Tile/Image.js
index a24242ba95..23a7c9668a 100644
--- a/lib/OpenLayers/Tile/Image.js
+++ b/lib/OpenLayers/Tile/Image.js
@@ -170,12 +170,12 @@ OpenLayers.Tile.Image = OpenLayers.Class(OpenLayers.Tile, {
             // Asynchronous image requests call the asynchronous getURL method
             // on the layer to fetch an image that covers 'this.bounds'.
             var id = this.asyncRequestId = (this.asyncRequestId || 0) + 1;
-            this.layer.getURLasync(this.bounds, OpenLayers.Function.bind(function(url) {
+            this.layer.getURLasync(this.bounds, function(url) {
                 if (id == this.asyncRequestId) {
                     this.url = url;
                     this.initImage();
                 }
-            }, this));
+            }, this);
         } else {
             // synchronous image requests get the url immediately.
             this.url = this.layer.getURL(this.bounds);