/** Возвращает текст sText преобразованный из кодировки srcCharset (по ум. windows-1251) в UTF-8
 * Обязателен только 1-й параметр 
 */
function sToUTF8(sText, bWithBOM, srcCharset) {
  if (!srcCharset) srcCharset = "windows-1251"; //Для ADODB.Stream default - Unicode. Еще можно KOI8-R, cp866
  with (new ActiveXObject("ADODB.Stream")) { //http://www.w3schools.com/ado/ado_ref_stream.asp
    type = 2; //Binary 1, Text 2 (default) 
    mode = 3; //Permissions have not been set 0,  Read-only 1,  Write-only 2,  Read-write 3,  
    //Prevent other read 4,  Prevent other write 8,  Prevent other open 12,  Allow others all 16
    charset = "utf-8";
    open();
    writeText(sText);
    position = 0;
    charset = srcCharset;
    var nPos = bWithBOM ? 0 : 3;
    return readText().substr(nPos);
  }
}