title: Javascript function with 2 arguments
body: <p>I need to create a function with 2 arguments (<code>price1</code>, <code>price2</code>), which should be added together and the result would be displayed in a text field after adding <code>Vat</code> to them.</p>
  
  <p>Overall, I need to have 3 text fields: <strong>price1</strong>, <strong>price2</strong> and <strong>results</strong>. In addition, the <strong>results</strong> field should be calculated after pushing the button <strong>calculate</strong>.</p>
  
  <p>So far, I've come up with a return function with <code>document.write</code>, but it obviously doesn't display any text fields, which looks like that:</p>
  
  <pre><code>function getTotalPrice(price1,price2,Vat)
  {
    var sum=price1+priceb;
    var Vat=20;
    return ((sum*Vat)*100)/100;
  }
  document.write(getTotalPrice(4,3));
  </code></pre>
  
  <p>I have no clue how to create the button that could calculate <code>Vat</code> and display it in the third text box.</p>