diff --git a/build.xml b/build.xml
index fc870825..143b3b5e 100644
--- a/build.xml
+++ b/build.xml
@@ -32,7 +32,6 @@
             <file name="src/job.js" />
             <file name="src/imageloader.js" />
             <file name="src/tilesource.js" />
-            <file name="src/dzierror.js" />
             <file name="src/dzitilesource.js" />
             <file name="src/button.js" />
             <file name="src/buttongroup.js" />
diff --git a/openseadragon.js b/openseadragon.js
index fabbc73a..111c8bf9 100644
--- a/openseadragon.js
+++ b/openseadragon.js
@@ -2583,17 +2583,6 @@ $.TileSource.prototype = {
 
 (function( $ ){
     
-$.DziError = function(message) {
-    Error.apply(this, arguments);
-    this.message = message;
-};
-$.DziError.prototype = new Error();
-$.DziError.constructor = $.DziError;
-
-}( OpenSeadragon ));
-
-(function( $ ){
-    
 
 $.DziTileSource = function(width, height, tileSize, tileOverlap, tilesUrl, fileFormat, displayRects) {
     $.TileSource.call(this, width, height, tileSize, tileOverlap, null, null);
@@ -2680,7 +2669,7 @@ $._DziTileSourceHelper.prototype = {
                 }, 1);
                 return null;
             }
-            throw new $.DziError(error);
+            throw new Error(error);
         }
 
         var urlParts = xmlUrl.split('/');
@@ -2697,12 +2686,9 @@ $._DziTileSourceHelper.prototype = {
                 return func(obj, tilesUrl);
             } catch (e) {
                 if (async) {
-                    //Start Thatcher - Throwable doesnt have getError
-                    //error = this.getError(e).message;
                     return null;
-                    //End Thatcher
                 } else {
-                    throw this.getError(e);
+                    throw e;
                 }
             }
         }
@@ -2732,11 +2718,11 @@ $._DziTileSourceHelper.prototype = {
     },
     processResponse: function(xhr, tilesUrl) {
         if (!xhr) {
-            throw new $.DziError($.Strings.getString("Errors.Security"));
+            throw new Error($.Strings.getString("Errors.Security"));
         } else if (xhr.status !== 200 && xhr.status !== 0) {
             var status = xhr.status;
             var statusText = (status == 404) ? "Not Found" : xhr.statusText;
-            throw new $.DziError($.Strings.getString("Errors.Status", status, statusText));
+            throw new Error($.Strings.getString("Errors.Status", status, statusText));
         }
 
         var doc = null;
@@ -2752,7 +2738,7 @@ $._DziTileSourceHelper.prototype = {
 
     processXml: function(xmlDoc, tilesUrl) {
         if (!xmlDoc || !xmlDoc.documentElement) {
-            throw new $.DziError($.Strings.getString("Errors.Xml"));
+            throw new Error($.Strings.getString("Errors.Xml"));
         }
 
         var root = xmlDoc.documentElement;
@@ -2763,22 +2749,22 @@ $._DziTileSourceHelper.prototype = {
                 return this.processDzi(root, tilesUrl);
             } catch (e) {
                 var defMsg = $.Strings.getString("Errors.Dzi");
-                throw (e instanceof $.DziError) ? e : new $.DziError(defMsg);
+                throw (e instanceof Error) ? e : new Error(defMsg);
             }
         } else if (rootName == "Collection") {
-            throw new $.DziError($.Strings.getString("Errors.Dzc"));
+            throw new Error($.Strings.getString("Errors.Dzc"));
         } else if (rootName == "Error") {
             return this.processError(root);
         }
 
-        throw new $.DziError($.Strings.getString("Errors.Dzi"));
+        throw new Error($.Strings.getString("Errors.Dzi"));
     },
 
     processDzi: function(imageNode, tilesUrl) {
         var fileFormat = imageNode.getAttribute("Format");
 
         if (!$.Utils.imageFormatSupported(fileFormat)) {
-            throw new $.DziError($.Strings.getString("Errors.ImageFormat",
+            throw new Error($.Strings.getString("Errors.ImageFormat",
                     fileFormat.toUpperCase()));
         }
 
@@ -2812,14 +2798,7 @@ $._DziTileSourceHelper.prototype = {
         var messageNode = errorNode.getElementsByTagName("Message")[0];
         var message = messageNode.firstChild.nodeValue;
 
-        throw new $.DziError(message);
-    },
-    getError: function(e) {
-        if (!(e instanceof DziError)) {
-            $.Debug.error(e.name + " while creating DZI from XML: " + e.message);
-            e = new $.DziError($.Strings.getString("Errors.Unknown"));
-        }
-
+        throw new Error(message);
     }
 };
 
diff --git a/src/dzierror.js b/src/dzierror.js
deleted file mode 100644
index 99263469..00000000
--- a/src/dzierror.js
+++ /dev/null
@@ -1,11 +0,0 @@
-
-(function( $ ){
-    
-$.DziError = function(message) {
-    Error.apply(this, arguments);
-    this.message = message;
-};
-$.DziError.prototype = new Error();
-$.DziError.constructor = $.DziError;
-
-}( OpenSeadragon ));
diff --git a/src/dzitilesource.js b/src/dzitilesource.js
index bc5627e0..4ab9a084 100644
--- a/src/dzitilesource.js
+++ b/src/dzitilesource.js
@@ -87,7 +87,7 @@ $._DziTileSourceHelper.prototype = {
                 }, 1);
                 return null;
             }
-            throw new $.DziError(error);
+            throw new Error(error);
         }
 
         var urlParts = xmlUrl.split('/');
@@ -104,12 +104,9 @@ $._DziTileSourceHelper.prototype = {
                 return func(obj, tilesUrl);
             } catch (e) {
                 if (async) {
-                    //Start Thatcher - Throwable doesnt have getError
-                    //error = this.getError(e).message;
                     return null;
-                    //End Thatcher
                 } else {
-                    throw this.getError(e);
+                    throw e;
                 }
             }
         }
@@ -139,11 +136,11 @@ $._DziTileSourceHelper.prototype = {
     },
     processResponse: function(xhr, tilesUrl) {
         if (!xhr) {
-            throw new $.DziError($.Strings.getString("Errors.Security"));
+            throw new Error($.Strings.getString("Errors.Security"));
         } else if (xhr.status !== 200 && xhr.status !== 0) {
             var status = xhr.status;
             var statusText = (status == 404) ? "Not Found" : xhr.statusText;
-            throw new $.DziError($.Strings.getString("Errors.Status", status, statusText));
+            throw new Error($.Strings.getString("Errors.Status", status, statusText));
         }
 
         var doc = null;
@@ -159,7 +156,7 @@ $._DziTileSourceHelper.prototype = {
 
     processXml: function(xmlDoc, tilesUrl) {
         if (!xmlDoc || !xmlDoc.documentElement) {
-            throw new $.DziError($.Strings.getString("Errors.Xml"));
+            throw new Error($.Strings.getString("Errors.Xml"));
         }
 
         var root = xmlDoc.documentElement;
@@ -170,22 +167,22 @@ $._DziTileSourceHelper.prototype = {
                 return this.processDzi(root, tilesUrl);
             } catch (e) {
                 var defMsg = $.Strings.getString("Errors.Dzi");
-                throw (e instanceof $.DziError) ? e : new $.DziError(defMsg);
+                throw (e instanceof Error) ? e : new Error(defMsg);
             }
         } else if (rootName == "Collection") {
-            throw new $.DziError($.Strings.getString("Errors.Dzc"));
+            throw new Error($.Strings.getString("Errors.Dzc"));
         } else if (rootName == "Error") {
             return this.processError(root);
         }
 
-        throw new $.DziError($.Strings.getString("Errors.Dzi"));
+        throw new Error($.Strings.getString("Errors.Dzi"));
     },
 
     processDzi: function(imageNode, tilesUrl) {
         var fileFormat = imageNode.getAttribute("Format");
 
         if (!$.Utils.imageFormatSupported(fileFormat)) {
-            throw new $.DziError($.Strings.getString("Errors.ImageFormat",
+            throw new Error($.Strings.getString("Errors.ImageFormat",
                     fileFormat.toUpperCase()));
         }
 
@@ -219,14 +216,7 @@ $._DziTileSourceHelper.prototype = {
         var messageNode = errorNode.getElementsByTagName("Message")[0];
         var message = messageNode.firstChild.nodeValue;
 
-        throw new $.DziError(message);
-    },
-    getError: function(e) {
-        if (!(e instanceof DziError)) {
-            $.Debug.error(e.name + " while creating DZI from XML: " + e.message);
-            e = new $.DziError($.Strings.getString("Errors.Unknown"));
-        }
-
+        throw new Error(message);
     }
 };