<SCRIPT LANGUAGE="JavaScript">
<!-- Beginning of JavaScript Applet and hide from old browsers -----

function formatNumTrailingDecimalZeros(floatingPointNum, len) {
  // Add missing trailing zero's after the period (.) used 
  // as decimal separator of the floating-point number.
  var numStr = "" + floatingPointNum;  // Force number to a string.
  if ( (numStr.lastIndexOf(".") == -1) && (len > 0) ) {
    numStr += ".";
  }
  while ( (numStr.length < (numStr.lastIndexOf(".") + 1 + len)) && (len > 0) ) {
    numStr += "0";
  }
  return numStr;
}

function roundit(Num, Places) {
  // Function to arithmetically round off a floating-point number to # decimal places.
  // Num: a floating-point number.
  // Places: a numerical (integer) value.
  // The formula to round any number to 'x' decimal points is:
  //   1) Multiple the original number by 10^x (10 to the power of x)
  //   2) Apply (in JavaScript) the Math.round() method to the result (any supplied 
  //      argument is rounded off to the 'nearest integer', and using the '.5' up rule)
  //   3) Divide result by 10^x
  if (Places > 0) {
    var tmpNumStr = "" + Num;  // Force number to a string.
    //var tmpNumStr = Num.toString();  // Convert number to a string.
    if ((tmpNumStr.length - tmpNumStr.lastIndexOf('.')) > (Places + 1)) {
      // Math.pow( num1, num2 )
      // pow: Returns the base argument raised to the exponent. 
      // The pow method raises 'num1', its first argument, 
      // to the power 'num2', its second argument.
      var Rounder = Math.pow(10, Places);
      return Math.round(Num * Rounder) / Rounder;  // Always rounding to the nearest integer.
    } else {
      return Num;
    }
  } else {
    return Math.round(Num);  // Always rounding to the nearest integer.
  }
}

function dkoereafrund(beloeb) {
  // Round Off to 'period twenty-five' floating-point number.
  // Rounds an amount off to divisible by 0.25 DKK.
  // Afrund til 'komma femogtyve' flydende decimaltal.
  // Afrunder et beloeb til deleligt med 0,25 kr.

  var afrbeloeb = 0;
  var resttal = 0;
  var resultatbeloeb = 0;

  // Note: All parameters (variables) passed to this function must 
  //   be valid - no error checking is performed.
  //   Moreover 'beloeb' must also be rounded off to a 'standard' 
  //   floating-point number (rounded to 2 decimal places).

  // Correction of small value errors.
  if ( (beloeb <= 0.124) && (beloeb >= -0.124) ) {
    resultatbeloeb = 0;
    // Return result.
    return resultatbeloeb;
  }

  // Rounds a given number to a specified number of decimal places
  // follow standard rules for rounding. That is, if the digit in
  // the position to the right of decimalplaces is 6 or greater, the
  // digit in the decimalplaces position is incremented by 1; if 5,
  // it becomes the nearest even number; otherwise, the digits to
  // the right of the decimalplaces are dropped. Format will use
  // the same format as that defined for positive values on negative
  // values, meaning that negative values will appear in the same
  // format as positive values.
  afrbeloeb = beloeb;

  // The modulo operator. Performs division on two numeric
  // expressions and returns only the remainder. If either of the
  // two numbers is a floating-point number, it's rounded to an
  // integer value prior to the modulo operation.
  // The remainder, expressed as an integer, is obtained (using the modulo operator).
  resttal = ( (afrbeloeb * 100) % 25 );  // Modulus.

  if ( afrbeloeb >= 0 ) {
    // Positive values. 
    if ( resttal >= 12.5 ) {
      // Range +13 to +24.
      resultatbeloeb = afrbeloeb + ((25 - resttal) / 100);
    } else {
      // Range +0 to +12.
      resultatbeloeb = afrbeloeb - ((resttal) / 100);
    }
  } else {
    // Negative values.
    if ( resttal >= -12.5 ) {
      // Range -1 to -12.
      resultatbeloeb = afrbeloeb - ((resttal) / 100);
    } else {
      // Range -13 to -24.
      resultatbeloeb = afrbeloeb + ((-25 - resttal) / 100);
    }
  }

  // Return result.
  return resultatbeloeb;
}

function dkoereafrund5(beloeb) {
  // Round Off to 'period fifty' floating-point number.
  // Rounds an amount off to divisible by 0.50 DKK.
  // Afrund til 'komma halvtreds' flydende decimaltal.
  // Afrunder et beloeb til deleligt med 0,50 kr.

  var afrbeloeb = 0;
  var resttal = 0;
  var resultatbeloeb = 0;

  // Note: All parameters (variables) passed to this function must 
  //   be valid - no error checking is performed.
  //   Moreover 'beloeb' must also be rounded off to a 'standard' 
  //   floating-point number (rounded to 2 decimal places).

  // Correction of small value errors.
  if ( (beloeb <= 0.254) && (beloeb >= -0.254) ) {
    resultatbeloeb = 0;
    // Return result.
    return resultatbeloeb;
  }

  // Rounds a given number to a specified number of decimal places
  // follow standard rules for rounding. That is, if the digit in
  // the position to the right of decimalplaces is 6 or greater, the
  // digit in the decimalplaces position is incremented by 1; if 5,
  // it becomes the nearest even number; otherwise, the digits to
  // the right of the decimalplaces are dropped. Format will use
  // the same format as that defined for positive values on negative
  // values, meaning that negative values will appear in the same
  // format as positive values.
  afrbeloeb = beloeb;

  // The modulo operator. Performs division on two numeric
  // expressions and returns only the remainder. If either of the
  // two numbers is a floating-point number, it's rounded to an
  // integer value prior to the modulo operation.
  // The remainder, expressed as an integer, is obtained (using the modulo operator).
  resttal = ( (afrbeloeb * 100) % 50 );  // Modulus.

  if ( afrbeloeb >= 0 ) {
    // Positive values. 
    if ( resttal >= 25.5 ) {
      // Range +26 to +49.
      resultatbeloeb = afrbeloeb + ((50 - resttal) / 100);
    } else {
      // Range +0 to +25.
      resultatbeloeb = afrbeloeb - ((resttal) / 100);
    }
  } else {
    // Negative values.
    if ( resttal >= -25.5 ) {
      // Range -1 to -25.
      resultatbeloeb = afrbeloeb - ((resttal) / 100);
    } else {
      // Range -26 to -49.
      resultatbeloeb = afrbeloeb + ((-50 - resttal) / 100);
    }
  }

  // Return result.
  return resultatbeloeb;
}

// - End of JavaScript code and done hiding -->
</SCRIPT>

<SCRIPT LANGUAGE="JavaScript">
<!-- Beginning of JavaScript Applet and hide from old browsers -----

var decimal_figure = parseFloat(your_floating-point_number_goes_here / dit_flydende_decimaltal_indsaettes_her);  // Force string to a number.

var ro_twenty_five_FPN = decimal_figure; // Stores Round Off 'period twenty-five' floating-point number.
var ro_fifty_FPN = decimal_figure; // Stores Round Off 'period fifty' floating-point number.

ro_twenty_five_FPN = roundit(ro_twenty_five_FPN, 2); // Round Off to 'standard' floating-point number (rounded to 2 decimal places).
ro_fifty_FPN = roundit(ro_fifty_FPN, 2); // Round Off to 'standard' floating-point number (rounded to 2 decimal places).

ro_twenty_five_FPN = dkoereafrund(ro_twenty_five_FPN); // Round Off to 'period twenty-five' floating-point number.
ro_fifty_FPN = dkoereafrund5(ro_fifty_FPN); // Round Off to 'period fifty' floating-point number.

ro_twenty_five_FPN = roundit(ro_twenty_five_FPN, 2); // Round Off to 'standard' floating-point number (rounded to 2 decimal places).
ro_fifty_FPN = roundit(ro_fifty_FPN, 2); // Round Off to 'standard' floating-point number (rounded to 2 decimal places).

var ro_twenty_five_Str = formatNumTrailingDecimalZeros(ro_twenty_five_FPN, 2); // Add missing trailing zero's after the period (.) used as decimal separator of the floating-point number.
var ro_fifty_Str = formatNumTrailingDecimalZeros(ro_fifty_FPN, 2); // Add missing trailing zero's after the period (.) used as decimal separator of the floating-point number.

// - End of JavaScript code and done hiding -->
</SCRIPT>