rem: var tree = document.getElementById('active_charsets'); 
add: var tree = document.getElementById('active_charsets'); 
context: function MoveUp() {  var tree = document.getElementById('active_charsets');   if (tree.selectedItems.length == 1) {    var selected = tree.selectedItems[0];    var before = selected.previousSibling    if (before) {      before.parentNode.insertBefore(selected, before);      tree.selectItem(selected);      tree.ensureElementIsVisible(selected);    }  }  enable_save();} //MoveUp
meta: 9421	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/9421/eaa6754a0a946375badf1165b3e4af3999e4b03c/pref-charset.js/buggy/xpfe/components/prefwindow/resources/content/pref-charset.js