text: if (typeof halumein == "undefined" || !halumein) {
      var halumein = {};
  }
  
  halumein.exchange = {
      init : function() {
  
          // console.log('exchange handler init');
  
          var $fromSumInput = $('[data-role=exchange-from_sum]'),
              $toSumInput = $('[data-role=exchange-to_sum]');
  
          $fromSumInput.keydown(function (e) {
              // Allow: backspace, delete, tab, escape, enter and .
              if ($.inArray(e.keyCode, [46, 8, 9, 27, 13, 110, 190]) !== -1 ||
                   // Allow: Ctrl+A
                  (e.keyCode == 65 && e.ctrlKey === true) ||
                   // Allow: Ctrl+C
                  (e.keyCode == 67 && e.ctrlKey === true) ||
                   // Allow: Ctrl+X
                  (e.keyCode == 88 && e.ctrlKey === true) ||
                   // Allow: home, end, left, right
                  (e.keyCode >= 35 && e.keyCode <= 39)) {
                       // let it happen, don't do anything
                       return;
              }
              // Ensure that it is a number and stop the keypress
              if ((e.shiftKey || (e.keyCode < 48 || e.keyCode > 57)) && (e.keyCode < 96 || e.keyCode > 105)) {
                  e.preventDefault();
              }
          });
  
          $fromSumInput.keyup(function (e) {
              $toSumInput.val($fromSumInput.val());
          });
  
          $toSumInput.keydown(function (e) {
              // Allow: backspace, delete, tab, escape, enter and .
              if ($.inArray(e.keyCode, [46, 8, 9, 27, 13, 110, 190]) !== -1 ||
                   // Allow: Ctrl+A
                  (e.keyCode == 65 && e.ctrlKey === true) ||
                   // Allow: Ctrl+C
                  (e.keyCode == 67 && e.ctrlKey === true) ||
                   // Allow: Ctrl+X
                  (e.keyCode == 88 && e.ctrlKey === true) ||
                   // Allow: home, end, left, right
                  (e.keyCode >= 35 && e.keyCode <= 39)) {
                       // let it happen, don't do anything
                       return;
              }
              // Ensure that it is a number and stop the keypress
              if ((e.shiftKey || (e.keyCode < 48 || e.keyCode > 57)) && (e.keyCode < 96 || e.keyCode > 105)) {
                  e.preventDefault();
              }
          });
  
      }
  }
  
  $(function() {
      halumein.exchange.init();
  });
  