function str_repeat (input, multiplier) {
  // http://kevin.vanzonneveld.net
  // +   original by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
  // +   improved by: Jonas Raoni Soares Silva (http://www.jsfromhell.com)
  // +   improved by: Ian Carter (http://euona.com/)
  // *     example 1: str_repeat('-=', 10);
  // *     returns 1: '-=-=-=-=-=-=-=-=-=-='

  var y = '';
  while (true) {
    if (multiplier & 1) {
      y += input;
    }
    multiplier >>= 1;
    if (multiplier) {
      input += input;
    }
    else {
      break;
    }
  }
  return y;
}

str_repeat('-=', 10);

'-=-=-=-=-=-=-=-=-=-='