<html>
<head>
<script type="text/javascript">
function showCharset()
{
var x=document.getElementById("myForm")
alert(x.acceptCharset)
}
</script>
</head>
<body>
<form id="myForm" acceptCharset="ISO-8859-1">
Text: <input type="text" value="Hello World!">
<input type="button" onclick="showCharset()" value="Show charset">
</form>
</body>
</html>