calcolo su texbox

[cavicchiandrea]

<form id="form1" name="form1" method="post" action="">
  <input type="text" onchange="document.getElementById('valore2').value=(this.value*1.36)" name="valore1" id="valore1" />
  <input type="text" name="valore2" id="valore2" />
</form>