Index: misc/autocomplete.js
===================================================================
RCS file: /cvs/drupal/drupal/misc/autocomplete.js,v
retrieving revision 1.14
diff -u -p -r1.14 autocomplete.js
--- misc/autocomplete.js	14 Oct 2006 02:39:48 -0000	1.14
+++ misc/autocomplete.js	21 Dec 2006 00:20:39 -0000
@@ -195,6 +195,11 @@ Drupal.jsAC.prototype.populatePopup = fu
  * Fills the suggestion popup with any matches received
  */
 Drupal.jsAC.prototype.found = function (matches) {
+  // If no value in the textfield, do not show the popup.
+  if (!this.input.value.length) {
+    return false;
+  }
+
   // Prepare matches
   var ul = document.createElement('ul');
   var ac = this;