// Original JavaScript code by Duncan Crombie: dcrombie@chirp.com.au
// Please acknowledge use of this code by including this header.

function formatNumber(number, format) {  
  // use: formatNumber(number, "format")

  // 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

  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 chars
  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 = "-" + 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;
}

function formatNode(num,format) {
  var rv;
  var textNode = document.createTextNode(formatNumber(num,format));
  if(num < 0) {
    rv = document.createElement("span");
    var attr = document.createAttribute("class");
    attr.value = "negative";
    rv.setAttributeNode(attr);
    rv.appendChild(textNode);
  } else {
    rv = textNode;
  }
  return rv;
}

// End formatNumber related code