Newthread to optional forums in dropdown

[Butcher]

yeah have tried but it's finding what the mods been called.
Searched newthread and got nothing

i'll keep looking though

--------------- Added [DATE]1238109489[/DATE] at [TIME]1238109489[/TIME] ---------------

well found nothing

However i've bashed on by myself and came up the idea of making a page with check boxes on. the value for these checkboxes are the forum id's. But how do i get this value onto the end of a url once hitting the submit button.
Ok that doesn't read very well. Let me try explain better.

In my template i start with this
<form action="newthread.php?do=newthread&f=" method="post">

Now after f= i want the forum id to be placed from the value of a checkbox.
Here's the code used for the check boxes
<input name="forumchoice[]" value="40" type="checkbox">
value 40 is forum id 40

at the end I have
<input name="forumchoice[]" value="Go" type="submit" class="button" /></form>

hope someone understand what i'm trying to do

cheers