diff -rupN filefield/filefield.js filefield_new/filefield.js
--- filefield/filefield.js	2010-04-24 12:47:49.000000000 +1000
+++ filefield.js	2010-07-16 01:07:15.000000000 +1000
@@ -39,6 +39,7 @@ Drupal.behaviors.filefieldValidateAutoAt
 Drupal.behaviors.filefieldButtons = function(context) {
   $('input.form-submit', context).bind('mousedown', Drupal.filefield.disableFields);
   $('div.filefield-element input.form-submit', context).bind('mousedown', Drupal.filefield.progressBar);
+  $('div.filefield-element input.form-submit', context).bind('mousedown', Drupal.filefieldDisableSubmit);
 };
 
 /**
@@ -129,3 +130,17 @@ Drupal.filefield = {
     return false;
   }
 };
+
+/**
+ * This disables all submit buttons while a file upload is in progress.
+ */
+
+// Disable all submit buttons.
+Drupal.filefieldDisableSubmit = function () {
+  $('input[type=submit]').attr('disabled', 'disabled').fadeTo(200, .20);
+}
+
+// Enable all submit buttons.
+Drupal.behaviors.filefieldEnableSubmit = function (context) {
+  $('input[type=submit]').removeAttr('disabled').fadeTo(200, 1);
+}