Prova cosi

codice:
<html>
</head>
<script>
function ForzareText(obj)
{  
	obj.focus();
	return false;
}
</script>
<body>

<form method="POST" action="--WEBBOT-SELF--">
  

<input type="text" name="T1" size="20" onchange="return ForzareText(this)"></p>
  

<input type="text" name="T2" size="20"></p>
</form>
</body>
</html>