Form hidden variables. help?

[SIZE=1]so my form requires a remotely hosted form processor in order for the mail to get to me. this is the required HTML code for the form, but how would i go about doing this AS?

[/SIZE][SIZE=1]<form action="[formprocesssor]"  method="post">
<input type="hidden" name="user_id" value="[myuserid]"> 
<input type="hidden" name="form_id" value="1"> 
[/SIZE] 
[SIZE=1]

[/SIZE]