diff --git a/content/html/document/src/nsImageDocument.cpp b/content/html/document/src/nsImageDocument.cpp
index 6a1b6ad01fe8..eb3e8ed55628 100644
--- a/content/html/document/src/nsImageDocument.cpp
+++ b/content/html/document/src/nsImageDocument.cpp
@@ -21,6 +21,7 @@
  *
  * Contributor(s):
  *    Morten Nilsen <morten@nilsen.com>
+ *    Christian Biesinger <cbiesinger@web.de>
  *
  * Alternatively, the contents of this file may be used under the terms of
  * either the GNU General Public License Version 2 or later (the "GPL"), or
@@ -398,7 +399,21 @@ nsImageDocument::CreateSyntheticDocument()
   nsHTMLValue val(src_string);
 
   image->SetHTMLAttribute(nsHTMLAtoms::src, val, PR_FALSE);
-  image->SetHTMLAttribute(nsHTMLAtoms::alt, val, PR_FALSE);
+
+  // Create a stringbundle for localized error message
+  nsCOMPtr<nsIStringBundle> bundle;
+  nsCOMPtr<nsIStringBundleService> stringService =
+           do_GetService(kStringBundleServiceCID, &rv);
+  if (NS_SUCCEEDED(rv) && stringService)
+    rv = stringService->CreateBundle(NSIMAGEDOCUMENT_PROPERTIES_URI, getter_AddRefs(bundle));
+  if (NS_SUCCEEDED(rv) && bundle) {
+    const PRUnichar* formatString[1] = { src_string.get() };
+    nsXPIDLString errorMsg;
+    rv = bundle->FormatStringFromName(NS_LITERAL_STRING("InvalidImage").get(), formatString, 1, getter_Copies(errorMsg));
+
+    nsHTMLValue errorText(errorMsg);
+    image->SetHTMLAttribute(nsHTMLAtoms::alt, errorText, PR_FALSE);
+  }
 
   root->AppendChildTo(body, PR_FALSE, PR_FALSE);
   center->AppendChildTo(image, PR_FALSE, PR_FALSE);
diff --git a/layout/html/forms/src/ImageDocument.properties b/layout/html/forms/src/ImageDocument.properties
index af15efe5f697..f78f7f3335ca 100644
--- a/layout/html/forms/src/ImageDocument.properties
+++ b/layout/html/forms/src/ImageDocument.properties
@@ -18,6 +18,7 @@
 # Contributor(s):
 #   Blake Ross <blakeross@telocity.com> (Original Author)
 #   Morten Nilsen <morten@nilsen.com>
+#   Christian Biesinger <cbiesinger@web.de>
 
 #LOCALIZATION NOTE (ImageTitleWithDimensionsAndFile): first %S is filename, second %S is type, third %S is width and fourth %S is height
 #LOCALIZATION NOTE (ImageTitleWithoutDimensions): first %S is filename, second %S is type
@@ -27,3 +28,5 @@ ImageTitleWithDimensionsAndFile=%S (%S Image, %Sx%S pixels)
 ImageTitleWithoutDimensions=%S (%S Image)
 ImageTitleWithDimensions=(%S Image, %Sx%S pixels)
 ImageTitleWithNeitherDimensionsNorFile=(%S Image)
+
+InvalidImage=The image \u201c%S\u201d cannot be displayed, because it contains errors.