<head>
<script src="jquery.js"></script>
<script>
$(document).bind('autofocus_ready', function() {
if (!("autofocus" in document.createElement("input"))) {
$("#q").focus();
}
}
</script>
</head>
<body>
<form name="f">
<input id="q" autofocus>
<script>$(document).trigger('autofocus_ready');</script>
<input type="submit" value="Go">
</form>
</body>