T.oby on "use jquery post onsubmit function"

Hi, I would like to post data to PHP via a jquery post after clicking a button using the onsubmit function:

<script>
function Do () {
  alert("Before");
  jQuery(document).ready(function($) {
    $.post("/code.php", {"arg1": "1", "arg2": "2"}, function(response) {
      alert('Got this from the server: ' + response);
    });
  });
  alert("After");
}
</script>
<form name="Form1" action="" onsubmit="Do()">
<input type="submit" value="Send">
</form>

Clicking the button the before and after text is shown but not the server response. I tested the code without the button and loading it directly, i.e.:

<script>
jQuery(document).ready(function($) {
  $.post("/code.php", {"arg1": "1", "arg2": "2"}, function(response) {
    alert('Got this from the server: ' + response);
  });
});
</script>

which worked.

Any help is highly appreciated - Thanks,

Toby