you dont realy beleave that?
i commented the script to make it a bit easier to read what it does, it's very simple like you said and i dont see where you could use this type of script most browsers submit on enter any way.
<form name="bob" METHOD="post" ACTION="http://ncaster.cjb.net">
<input type="text" name="textfield">
<input type="submit" name="Submit" value="Submit">
</form><script language=javascript>
// this is our java script even, on key down.
document.onkeydown=go_submit();
function go_submit() { // this is our submit func
var key= event.keyCode; // get key
if(key == 13) { // 13 = enter
document.forms['bob'].submit(); // submit bob form
}
}
</script>