Index: filefield.js
===================================================================
RCS file: /cvs/drupal-contrib/contributions/modules/filefield/filefield.js,v
retrieving revision 1.13
diff -u -r1.13 filefield.js
--- filefield.js	31 Jan 2009 17:56:22 -0000	1.13
+++ filefield.js	2 Mar 2009 04:53:29 -0000
@@ -30,4 +30,38 @@
      */
     /* @todo */
   });
-}
+};
+
+/**
+ * Prevent FileField uploads when using buttons not intended to upload.
+ */
+Drupal.behaviors.filefieldButtons = function(context) {
+  $('input.form-submit.ahah-processed').bind('mousedown', Drupal.filefield.disableFields);
+};
+
+/**
+ * Utility functions for use by FileField.
+ * @param {Object} event
+ */
+Drupal.filefield = {
+  disableFields: function(event){
+    var clickedButton = this;
+
+    // Using the grandparent, we ensure that we get up to at least the level
+    // of the CCK multiple field wrapper.
+    var $enabledFields = $(this).parent().parent().find('input.form-file');
+    var $disabledFields = $('div.filefield-element input.form-file').not($enabledFields);
+
+    // Disable upload fields other than the one we're currently working with.
+    $disabledFields.attr('disabled', 'disabled');
+
+    // All the other mousedown handlers (like AHAH) are excuted before any
+    // timeout functions will be called, so this effectively re-enables
+    // the filefields after the AHAH process is complete even though it only
+    // has a 1 millisecond timeout.
+    setTimeout(function(){
+      $disabledFields.attr('disabled', '');
+    }, 1);
+  }
+};
+