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diff --git a/rt/share/html/NoAuth/js/userautocomplete.js b/rt/share/html/NoAuth/js/userautocomplete.js
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+%# BEGIN BPS TAGGED BLOCK {{{
+%#
+%# COPYRIGHT:
+%#
+%# This software is Copyright (c) 1996-2012 Best Practical Solutions, LLC
+%#                                          <sales@bestpractical.com>
+%#
+%# (Except where explicitly superseded by other copyright notices)
+%#
+%#
+%# LICENSE:
+%#
+%# This work is made available to you under the terms of Version 2 of
+%# the GNU General Public License. A copy of that license should have
+%# been provided with this software, but in any event can be snarfed
+%# from www.gnu.org.
+%#
+%# This work is distributed in the hope that it will be useful, but
+%# WITHOUT ANY WARRANTY; without even the implied warranty of
+%# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+%# General Public License for more details.
+%#
+%# You should have received a copy of the GNU General Public License
+%# along with this program; if not, write to the Free Software
+%# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+%# 02110-1301 or visit their web page on the internet at
+%# http://www.gnu.org/licenses/old-licenses/gpl-2.0.html.
+%#
+%#
+%# CONTRIBUTION SUBMISSION POLICY:
+%#
+%# (The following paragraph is not intended to limit the rights granted
+%# to you to modify and distribute this software under the terms of
+%# the GNU General Public License and is only of importance to you if
+%# you choose to contribute your changes and enhancements to the
+%# community by submitting them to Best Practical Solutions, LLC.)
+%#
+%# By intentionally submitting any modifications, corrections or
+%# derivatives to this work, or any other work intended for use with
+%# Request Tracker, to Best Practical Solutions, LLC, you confirm that
+%# you are the copyright holder for those contributions and you grant
+%# Best Practical Solutions,  LLC a nonexclusive, worldwide, irrevocable,
+%# royalty-free, perpetual, license to use, copy, create derivative
+%# works based on those contributions, and sublicense and distribute
+%# those contributions and any derivatives thereof.
+%#
+%# END BPS TAGGED BLOCK }}}
+jQuery(function() {
+    // inputs that accept multiple email addresses
+    var multipleCompletion = new Array("Requestors", "To", "Bcc", "Cc", "AdminCc", "WatcherAddressEmail[123]", "UpdateCc", "UpdateBcc");
+
+    // inputs with only a single email address allowed
+    var singleCompletion   = new Array("(Add|Delete)Requestor", "(Add|Delete)Cc", "(Add|Delete)AdminCc");
+
+    // inputs for only privileged users
+    var privilegedCompletion = new Array("AddPrincipalForRights-user");
+
+    // build up the regexps we'll use to match
+    var applyto  = new RegExp('^(' + multipleCompletion.concat(singleCompletion, privilegedCompletion).join('|') + ')$');
+    var acceptsMultiple = new RegExp('^(' + multipleCompletion.join('|') + ')$');
+    var onlyPrivileged = new RegExp('^(' + privilegedCompletion.join('|') + ')$');
+
+    var inputs = document.getElementsByTagName("input");
+
+    for (var i = 0; i < inputs.length; i++) {
+        var input = inputs[i];
+        var inputName = input.getAttribute("name");
+
+        if (!inputName || !inputName.match(applyto))
+            continue;
+
+        var options = {
+            source: "<% RT->Config->Get('WebPath')%>/Helpers/Autocomplete/Users"
+        };
+
+        var queryargs = [];
+
+        if (inputName.match("AddPrincipalForRights-user")) {
+            queryargs.push("return=Name");
+            options.select = addprincipal_onselect;
+            options.change = addprincipal_onchange;
+        }
+
+        if (inputName.match(onlyPrivileged)) {
+            queryargs.push("privileged=1");
+        }
+
+        if (inputName.match(acceptsMultiple)) {
+            queryargs.push("delim=,");
+
+            options.focus = function () {
+                // prevent value inserted on focus
+                return false;
+            }
+
+            options.select = function(event, ui) {
+                var terms = this.value.split(/,\s*/);
+                terms.pop();                    // remove current input
+                terms.push( ui.item.value );    // add selected item
+                this.value = terms.join(", ");
+                return false;
+            }
+        }
+
+        if (queryargs.length)
+            options.source += "?" + queryargs.join("&");
+
+        jQuery(input).autocomplete(options);
+    }
+});