add: if (document.frm_help.check==undefined) { return; } 
context: function resetList() {  // reset preview and check boxes to initial values  var to_check;  var list = original_field.split(',');  writePreview(list);  for (box=0; box < document.frm_help.check.length; box++) {      check = document.frm_help.check[box];      to_check = false;      for (val in list) {          if (check.value==trim(list[val])) {              to_check = true;              break;          }      }      check.checked = to_check;  }}
meta: 7632	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/7632/6f39a8ca9844a8032fddbcb96a87f5de43991f6f/help_controls.js/clean/templates/classic/html/help_controls.js