Converts Numbers to Words

numbertoword.js

// Convert numbers to words
// copyright 25th July 2006, by Stephen Chapman http://javascript.about.com
// permission to use this Javascript on your web page is granted
// provided that all of the code (including this copyright notice) is
// used exactly as shown (you can change the numbering system if you wish)

/*
Documentation: Usage
=====================
1. Import the javascript file:
<script src="numbertoword.js"></script>
2. Call the function toWords(number) passing a number to it: 
<script>
  var number=1000;
  var Inwords=toWords(number);
<script>
*/

// American Numbering System
var th = ['', 'thousand', 'million', 'billion', 'trillion'];
// uncomment this line for English Number System
// var th = ['','thousand','million', 'milliard','billion'];

var dg = ['zero', 'one', 'two', 'three', 'four', 'five', 'six', 'seven', 'eight', 'nine'];
var tn = ['ten', 'eleven', 'twelve', 'thirteen', 'fourteen', 'fifteen', 'sixteen', 'seventeen', 'eighteen', 'nineteen'];
var tw = ['twenty', 'thirty', 'forty', 'fifty', 'sixty', 'seventy', 'eighty', 'ninety'];
function toWords(s) {
  s = s.toString();
	s = s.replace(/[\, ]/g, '');
	if (s != parseFloat(s))
		return 'not a number ';
	var x = s.indexOf('.');
	if (x == -1)
		x = s.length;
	if (x > 15)
		return 'too big';
	var n = s.split('');
	var str = '';
	var sk = 0;
	for (var i = 0; i < x; i++) {
		if ((x - i) % 3 == 2) {
			if (n[i] == '1') {
				str += tn[Number(n[i + 1])] + ' ';
				i++;
				sk = 1;
			} else if (n[i] != 0) {
				str += tw[n[i] - 2] + ' ';
				sk = 1;
			}
		} else if (n[i] != 0) {
			str += dg[n[i]] + ' ';
			if ((x - i) % 3 == 0)
				str += 'hundred ';
			sk = 1;
		}
		if ((x - i) % 3 == 1) {
			if (sk)
				str += th[(x - i - 1) / 3] + ' ';
			sk = 0;
		}
	}
	if (x != s.length) {
		var y = s.length;
		str += 'point ';
		for (var i = x + 1; i < y; i++)
			str += dg[n[i]] + ' ';
	}
	return str.replace(/\s+/g, ' ');
}