Data From Hidden Field Is Not Sent To Server...

I have a form whereby I can add multiple contacts to a single address.
There is only one firstname/lastname/telephone box - when the user
clicks the add button, I read the values from the form fields and
record them into a hidden text input field. This part works because
during debugging, I have converted the <input type=hidden> into a <input
type=text> to visably confirm my data is being copied into the 'hidden'
field.

Once the user has entered in one or more names, they can click another
button and submit the form for processing. My idea is that I would then
parse this hidden field server side...

I have a WAMPHP based server and as a test, I dump out my entire $_POST
(basically, the name and value in every INPUT tag).

My PHP script picks up the name of every input tag, including the hidden
field (like it should) but for some reason, the value that was written
to the hidden field is not passed to the server. Thus, for the PHP folk
reading this post, my hidden input field is called mylist and
$_POST['mylist'] exists, but its empty. Even though before processing,
I could visably see the input in the box (for debugging remember, I made
the input tag box a normal, unhidden one).

Here is what I have done to try and resolve:
- I have used both Mozilla 1.7.5 and IE6 - both provide same results -
my hidden field name gets passed, but not its value.

- I have created another hidden field and given it a default value ie I
have <input type="hidden" name="extraone" value="xyz"> and I get
$_POST['extraone']="xyz" passed to my php server, like I would expect -
however, the value of mylist is sent empty, even though it has data.

- I have even put in a javascript alert box just before the form is sent
to the server and can see the result in my (unhidden) box, and the same
value displayed in the javascript alert - but again, the value of the
mylist does not get sent to the server.


The only difference is that my hidden field (even if its displayed like
an ordinary text input box) does not post data written to form fields as
the result of a javascript function. Interestingly though, the server
does know about the input tag box since it does receive
$_POST['mylist'], it justs receives it empty.

What gives? If the form reads my input from one field, and writes it to
another field, then it should be sent to the server, true?

Also... my tags are all inside my <form></form> tag (which is proven by
double checking, and the fact that I do get the input tag box name sent
to my server).

Since I can see the data values in the box, it tells me my javascript is
doing what it should be doing - so I don't see any point in including my
javascript (though I have no problems doing so if someone requests
it). On the php server, I am using a simple phpinfo(); to check the
data is being received...