[Javascript] Prepacking the HTTP_POST array from JavaScript

[David Lovering]

Anybody have any insanely cute ways of pre-packing some additional variables
onto a HTTP_POST session (in addition to the form fields) prior to invoking
the appropriate htmlForm.submit() call?  I'd like to be able to augment the
formlist fields with some computed fields (mostly involving security-related
thingies), and I sure don't want to stick in any more hidden fields if I can
help it.  Also, I don't want the user on the client machine to be able to
query those variables, as some of them may give them an edge in penetrating
aspects of the code I'd just as soon keep secure.

For example, if I have a form

<form name='myForm' id='myForm' enctype='multipart/form-data' method='post'
onsubmit='myCode.js' action='dosomething.php'>
  <table cellspacing=0 cellpadding=3 align='center' valign='top' border=0>
    <tr>
      <td align='right' valign='middle'>my input</td>
      <td align='left' valign='middle'><input type='text' size=30
name='my_input' value=''></td>
    </tr>
    <tr>
      <td></td>
      <td align='left' valign='middle'><input type='submit'
value='submit'></td>
    </tr>
  </table>
</form>

what must I insert in the code routine 'myCode.js' to add another field, say
'authcode=F7A623' to the HTTP_POST_VARS array which is seen by
dosomething.php?

With HTTP_GET variables it is simply a matter of packing the URL with the
variable-names, their values, and the appropriate separators.  Obviously,
with a POST this method doesn't strictly apply.

[Don't get hung up on the PHP code issue -- the forms handler could be
almost anything].

-- Dave Lovering