Yeah, I was trying this:
Code:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<title>Untitled Document</title>
<script type="text/javascript">
function doIt(_obj) {
/*
Couldnd't get this working:
if (the_key_pressed_in_ascii == 8) //Backspace
	{
	return true
	}
*/
if (_obj.value.length > 15)
	{
	return false
	}
}
</script>
</head>

<body>
<textarea onKeyPress="return doIt(this)"></textarea>
</body>
</html>
but your code is robably better.