TaxCalculator = {}


TaxCalculator.grossUp = function(net) {

  var gross = net * 1.28;
  return gross;

} // closing function

TaxCalculator.getSalary = function(net, freq) {

  return net * freq;

} // closing function



TaxCalculator.doCalculation = function() {

  var net = document.getElementById("sum").value;
  var freq = document.getElementById("freq").value;
  var salary = TaxCalculator.getSalary(net, freq);
  var result = TaxCalculator.grossUp(salary);
  // build up the string...
  var annual = parseInt(result);
  var monthly = parseInt(result/12);
  var weekly = parseInt(result/52);
  
  var html = '';
  html += '<p>Gross annual salary is &pound\;' + annual + '<\/p>';
  html += '<p>Gross monthly salary is  &pound\;' + monthly + '<\/p>';
  html += '<p>Gross weekly salary is  &pound\;' + weekly + '<\/p>';
  html += '<p class="smallprint">This figure should only be used as an approximation.  It ignores NI contributions and personal tax allowances.<\/p>';
  document.getElementById("tax-calculator-results").innerHTML = html;
  
  
} // closing function