String.prototype.ToUnicode = function ()
{
  var charmap = unescape(
    "%u0402%u0403%u201A%u0453%u201E%u2026%u2020%u2021%u20AC%u2030%u0409%u2039%u040A%u040C%u040B%u040F"+
    "%u0452%u2018%u2019%u201C%u201D%u2022%u2013%u2014%u0000%u2122%u0459%u203A%u045A%u045C%u045B%u045F"+
    "%u00A0%u040E%u045E%u0408%u00A4%u0490%u00A6%u00A7%u0401%u00A9%u0404%u00AB%u00AC%u00AD%u00AE%u0407"+
    "%u00B0%u00B1%u0406%u0456%u0491%u00B5%u00B6%u00B7%u0451%u2116%u0454%u00BB%u0458%u0405%u0455%u0457"
  );
  var code2char = function(code)
  {
    if(code >= 0xC0 && code <= 0xFF) return String.fromCharCode(code - 0xC0 + 0x0410)
    if(code >= 0x80 && code <= 0xBF) return charmap.charAt(code - 0x80)
    return String.fromCharCode(code)
  };
  var res = "";
  for(var i = 0; i < this.length; i++) res = res + code2char(this.charCodeAt(i));
  return res;
}
String.prototype.ToUtf8 = function ()
{
  return encodeURIComponent(this);
}

String.prototype.UrlGetVariable = function (VarName)
{
  var n = new String(VarName);
  var s = new String(this);
  var i1 = s.indexOf('?' + n + '=');
  var i2 = s.indexOf('&' + n + '=');
  var i;
  if(i1 >= 0)
  {
    i = i1 + 1 + n.length + 1;
  }
  else if(i2 >= 0)
  {
    i = i2 + 1 + n.length + 1;
  }
  else
  {
    i = -1;
  }
  if(i >= 0)
  {
    s = s.substring(i);
    s = s.replace(/^([^&]*)(.*)$/g, '$1');
    return s;
  }
  return '';
}

String.prototype.Trim = function (Symbol)
{
  if(!XLCommon.IsEmpty(Symbol))
  {
    var s = this, t = "";
    while(s.length > 0)
    {
      t = s;
      for(var i = 0; i < Symbol.length; i++)
      {
        if(Symbol.indexOf(i) == s.charAt(0))
        {
          s = s.substring(1);
          break;
        }
      }
      if(s == t)
      {
        for(var i = 0; i < Symbol.length; i++)
        {
          if(Symbol.indexOf(i) == s.charAt(s.length - 1))
          {
            s = s.substring(0, s.length - 1);
            break;
          }
        }
      }
      if(s == t) break;
    }
    return s;
  }
  return this.replace(/^[\s]+/g, '').replace(/[\s]+$/g, '');
}

String.prototype.IndexOf = function (Symbol)
{
  var s = this.split(Symbol);
  if(s.length > 1)
  {
    return s[0].length;
  }
  return -1;
}