--- misc/autocomplete.js	2011-12-16 20:46:42.000000000 -0500
+++ misc/autocomplete.js	2011-12-16 20:48:58.000000000 -0500
@@ -112,6 +114,7 @@
  */
 Drupal.jsAC.prototype.select = function (node) {
   this.input.value = $(node).data('autocompleteValue');
+  $(this.input).trigger('autocompleteSelect', [node]);
 };
 
 /**
@@ -165,7 +168,7 @@
 Drupal.jsAC.prototype.hidePopup = function (keycode) {
   // Select item if the right key or mousebutton was pressed.
   if (this.selected && ((keycode && keycode != 46 && keycode != 8 && keycode != 27) || !keycode)) {
-    this.input.value = $(this.selected).data('autocompleteValue');
+    this.select(this.selected);
   }
   // Hide popup.
   var popup = this.popup;
@@ -218,7 +221,7 @@
   for (key in matches) {
     $('<li></li>')
       .html($('<div></div>').html(matches[key]))
-      .mousedown(function () { ac.select(this); })
+      .mousedown(function () { ac.hidePopup(this); })
       .mouseover(function () { ac.highlight(this); })
       .mouseout(function () { ac.unhighlight(this); })
       .data('autocompleteValue', key)