/*******************************************************************
*
* Euros - take a price in pounds and print as Euros
*
* Input: spounds         - a string in pounds, URL encoded
*
* Output: A string formatted in the new currency
*
********************************************************************/

function Euros(spounds)
  {
  document.write(ConvertCurrency(spounds, eurorate, "€", ","));  // Format & output in Euros
  }

/*******************************************************************
*
* Dollars - take a price in pounds and print as Dollars
*
* Input: spounds         - a string in pounds, URL encoded
*
* Output: A string formatted in the new currency
*
********************************************************************/

function Dollars(spounds)
  {
  document.write(ConvertCurrency(spounds, dollarrate, "$", "."));  // Format & output in Dollars
  }

/*******************************************************************
*
* ConvertCurrency - take a price in pounds and convert to Currency
*
* This assumes that the currency symbol goes at the front and
* that it has two decimal places. This works for Dollars, Euros etc.
*
* Input: spounds         - a string in pounds, URL encoded
*      nConversionRate - number of x in a pound
*         sCurrencySymbol - symbol to display
*         sDecimalPoint   - decimal point symbol
*
* Returns: A string formatted in the new currency
*
********************************************************************/

function ConvertCurrency(spounds, nConversionRate, sSymbol, sDecimalPoint)
  {
  var   nPounds, nCurrency, nWholeCurrency, nFraction, sFraction;

  nPounds = ExtractPounds(spounds);                    // Extract the number
of pounds as a float
  nCurrency = Math.round(nPounds * nConversionRate * 100) / 100;   // Work
out the new currency
  nWholeCurrency = Math.floor(nCurrency);              // Number of whole
Currency
  nFraction = Math.floor((nCurrency - nWholeCurrency) * 100);  // Number of Fraction (2 decimal places)
  if (nFraction < 10)                                  // Needs to be two
digits
    {
    sFraction = "0" + nFraction.toString();            // Pad with leading
zero
    }
  else
    {                                                 // Already has two
digits
    sFraction = nFraction.toString();                  // So just format it
    }
  return(sSymbol + nWholeCurrency.toString() + sDecimalPoint + sFraction); // Format the number with the symbol
  }

/*******************************************************************
*
* ExtractPounds - extract a numeric value from an HTML formatted string
*
* Input: spounds         - a string in pounds, URL encoded
*
* Returns: Nuneric value of pounds & pence
*
********************************************************************/

function ExtractPounds(spounds)
  {
  var nPoundPos, nDecimalPos, nPoundEnd, nDecimalEnd;
  var sWholePounds, sPence;

  //
  // The formatted value should start with a pound sign
  //
  nPoundPos = spounds.indexOf("£");                   // Find the pound sign
  if (nPoundPos < 0)                                  // Bad format
    {
    nPoundPos = spounds.indexOf("&#163;");            // Look for URL
encoded version
    if (nPoundPos < 0)                                // Still not found
      {
      return(0);
      }
    nPoundEnd = nPoundPos + 6;                        // Skip URL encoded
value
    }
  else
    {
    nPoundEnd = nPoundPos + 1;                        // Just skip single
character
    }
  //
  // Then look for the decimal point
  //
  nDecimalPos = spounds.indexOf(".");                 // Find the decimal
point
  if (nDecimalPos < 0)                                // No decimal point
    {
    nDecimalPos = spounds.indexOf("&#46;");          // Look for URL encoded
version
    if (nDecimalPos < 0)
      {
      return(0);
      }
    nDecimalEnd = nDecimalPos + 5;                    // Skip past the match
    }
  else
    {
    nDecimalEnd = nDecimalPos + 1;
    }
  sWholePounds = spounds.substring(nPoundEnd, nDecimalPos);  // Get the whole pounds
  sPence = spounds.substring(nDecimalEnd, spounds.length); // Get the number of pence
  //
  // Purists would do more validation here
  //
  return(parseInt(sWholePounds) + (parseInt(sPence)/ 100));  // Build a floating point value
  }