rem: if (charsetAtom && (charsetAtom.GetUnicode() == "us-ascii")) 
add: if (charsetAtom && (charsetAtom.equals("us-ascii"))) 
context: function UpdateMailEditCharset(){  var send_default_charset = gMsgCompose.compFields.defaultCharacterSet;//  dump("send_default_charset is " + send_default_charset + "\n");  var compFieldsCharset = gMsgCompose.compFields.characterSet;//  dump("gMsgCompose.compFields is " + compFieldsCharset + "\n");  if (gCharsetConvertManager) {    var charsetAtom = gCharsetConvertManager.GetCharsetAtom(compFieldsCharset);    if (charsetAtom && (charsetAtom.GetUnicode() == "us-ascii"))      compFieldsCharset = "ISO-8859-1";   // no menu item for "us-ascii"  }  // charset may have been set implicitly in case of reply/forward  // or use pref default otherwise  var menuitem = document.getElementById(send_default_charset == compFieldsCharset ?                                          send_default_charset : compFieldsCharset);  if (menuitem)    menuitem.setAttribute('checked', 'true');  // Set a document charset to a default mail send charset.  if (send_default_charset == compFieldsCharset)    SetDocumentCharacterSet(send_default_charset);}
meta: 8395	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/8395/ecf24a2b786c6839fa640210ff9337b4da39d454/MsgComposeCommands.js/clean/mailnews/compose/resources/content/MsgComposeCommands.js