Javascript моментален калкулатор на 2 полета

<table width="80%" border="0">
  <tr>
    <th>Box 1</th>
    <th>Box 2</th>
    <th>Result</th>
  </tr>
  <tr>
    <td><input id="box1" type="text" oninput="calculate()" /></td>
    <td><input id="box2" type="text" oninput="calculate()" /></td>
    <td><input id="result" /></td>
  </tr>
  <tr>
    <td>&nbsp;</td>
    <td>&nbsp;</td>
    <td>&nbsp;</td>
  </tr>
</table>

<script>
function calculate() {
var myBox1 = document.getElementById('box1').value;
var myBox2 = document.getElementById('box2').value;
var result = document.getElementById('result');
var myResult = myBox1 * myBox2;
result.value = myResult;
     

}
</script>