JavaScript Tutorial/Form/this
Use this to reference current form
<html>
<head>
<title>Testing this</title>
</head>
<body>
<h1>Testing this</h1>
<form action="http://www.wbex.ru">
<input type="text" name="emailAD" size="15" value="Email Address" onfocus="this.value=""">
<br /><submit value="Subscribe">
</form>
</body>
</html>