<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
"http://www.w3.org/TR/html4/strict.dtd">
<html>
<body>
<head>
<script>
function form_submit() {
document.getElementById("val").value = "баба";
document.getElementById("f").submit();
}
</script>
</head>
<form id="f" action="u">
[% id %] <br />
[% val %]
<input type="submit" />
</form>
</body>
</html>