// JavaScript Document
// CONSTANTS
var separator = ",";  // use comma as 000's separator
var decpoint = ".";  // use period as decimal point
var percent = "%";
var currency = "$";  // use dollar sign for currency

function formatNumber(number, format, print) {  // use: formatNumber(number, "format")
	if (print) document.write("formatNumber(" + number + ", \"" + format + "\")<br>");

	if (number - 0 != number) return null;  // if number is NaN return null
	var useSeparator = format.indexOf(separator) != -1;  // use separators in number
	var usePercent = format.indexOf(percent) != -1;  // convert output to percentage
	var useCurrency = format.indexOf(currency) != -1;  // use currency format
	var isNegative = (number < 0);
	number = Math.abs (number);
	if (usePercent) number *= 100;
	format = strip(format, separator + percent + currency);  // remove key characters
	number = "" + number;  // convert number input to string

	 // split input value into LHS and RHS using decpoint as divider
	var dec = number.indexOf(decpoint) != -1;
	var nleftEnd = (dec) ? number.substring(0, number.indexOf(".")) : number;
	var nrightEnd = (dec) ? number.substring(number.indexOf(".") + 1) : "";

	 // split format string into LHS and RHS using decpoint as divider
	dec = format.indexOf(decpoint) != -1;
	var sleftEnd = (dec) ? format.substring(0, format.indexOf(".")) : format;
	var srightEnd = (dec) ? format.substring(format.indexOf(".") + 1) : "";

	 // adjust decimal places by cropping or adding zeros to LHS of number
	if (srightEnd.length < nrightEnd.length) {
	  var nextChar = nrightEnd.charAt(srightEnd.length) - 0;
	  nrightEnd = nrightEnd.substring(0, srightEnd.length);
	  if (nextChar >= 5) nrightEnd = "" + ((nrightEnd - 0) + 1);  // round up

	// patch provided by Patti Marcoux 1999/08/06
	  while (srightEnd.length > nrightEnd.length) {
	    nrightEnd = "0" + nrightEnd;
	  }

	  if (srightEnd.length < nrightEnd.length) {
	    nrightEnd = nrightEnd.substring(1);
	    nleftEnd = (nleftEnd - 0) + 1;
	  }
	} else {
	  for (var i=nrightEnd.length; srightEnd.length > nrightEnd.length; i++) {
	    if (srightEnd.charAt(i) == "0") nrightEnd += "0";  // append zero to RHS of number
	    else break;
	  }
	}

	 // adjust leading zeros
	sleftEnd = strip(sleftEnd, "#");  // remove hashes from LHS of format
	while (sleftEnd.length > nleftEnd.length) {
	  nleftEnd = "0" + nleftEnd;  // prepend zero to LHS of number
	}

	if (useSeparator) nleftEnd = separate(nleftEnd, separator);  // add separator
	var output = nleftEnd + ((nrightEnd != "") ? "." + nrightEnd : "");  // combine parts
	output = ((useCurrency) ? currency : "") + output + ((usePercent) ? percent : "");
	if (isNegative) {
	  // patch suggested by Tom Denn 25/4/2001
	  output = (useCurrency) ? "(" + output + ")" : "-" + output;
	}
	return output;
}

function strip(input, chars) {  // strip all characters in 'chars' from input
	var output = "";  // initialise output string
	for (var i=0; i < input.length; i++)
	  if (chars.indexOf(input.charAt(i)) == -1)
	    output += input.charAt(i);
	return output;
}

function separate(input, separator) {  // format input using 'separator' to mark 000's
	input = "" + input;
	var output = "";  // initialise output string
	for (var i=0; i < input.length; i++) {
	  if (i != 0 && (input.length - i) % 3 == 0) output += separator;
	  output += input.charAt(i);
	}
	return output;
}