codice:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>
<head>
<title>Untitled</title>
</head>
<body>
<input type="text" id="var1" value="esempio">

<script language="JavaScript" type="text/javascript">
<!--
document.all.var1.select();
//-->
</script>

</body>
</html>