diff --git misc/ahah.js misc/ahah.js
index 4a895a8..2337a94 100644
--- misc/ahah.js
+++ misc/ahah.js
@@ -221,5 +221,5 @@ Drupal.ahah.prototype.error = function (response, uri) {
   // Undo hide.
   $(this.wrapper).show();
   // Re-enable the element.
-  $(this.element).removeClass('progess-disabled').attr('disabled', false);
+  $(this.element).removeClass('progress-disabled').attr('disabled', false);
 };
diff --git modules/system/system-rtl.css modules/system/system-rtl.css
index 5c7790d..9da0ea4 100644
--- modules/system/system-rtl.css
+++ modules/system/system-rtl.css
@@ -74,7 +74,7 @@ div.teaser-button-wrapper {
 .progress .percentage {
   float: left;
 }
-.progess-disabled {
+.progress-disabled {
   float: right;
 }
 .ahah-progress {