<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>Untitled</title>
</head>
<body>
<form>
<input type="text" name="parola" value="" onChange="Conta_caratteri()">
<br>
Numeri dei caratteri
<input type="text" name="NumCaratteri" value="">
</form>
<script language="javascript">
function Conta_caratteri()
{
var testo=document.forms[0].parola;
var Caratteri=document.forms[0].NumCaratteri;
var str1=testo.value.toString();
Caratteri.value=str1.lenght;
}
</script>
</body>
</html>