function number_format (number, decimals, dec_point, thousands_sep) {
   
	  var exponent = "";
    var numberstr = number.toString ();
    var eindex = numberstr.indexOf ("e");
    
		if (eindex > -1) {
      exponent = numberstr.substring (eindex);
      number = parseFloat (numberstr.substring (0, eindex));
    }
    
    if (decimals != null) {
      var temp = Math.pow (10, decimals);
      number = Math.round (number * temp) / temp;
    }
		
    var sign = number < 0 ? "-" : "";
    var integer = (number > 0 ? 
        Math.floor (number) : Math.abs (Math.ceil (number))).toString ();
    
    var fractional = number.toString ().substring (integer.length + sign.length);
    dec_point = dec_point != null ? dec_point : ".";
    fractional = decimals != null && decimals > 0 || fractional.length > 1 ? 
                 (dec_point + fractional.substring (1)) : "";
    
		if (decimals != null && decimals > 0)
      for (i = fractional.length - 1, z = decimals; i < z; ++i)
        fractional += "0";
    
    thousands_sep = (thousands_sep != dec_point || fractional.length == 0) ? 
                    thousands_sep : null;
    if (thousands_sep != null && thousands_sep != "")
    	for (i = integer.length - 3; i > 0; i -= 3)
        integer = integer.substring (0 , i) + thousands_sep + integer.substring (i);
    
    return sign + integer + fractional + exponent;
		
  }