html forms within the server generated form tag

Ok, I'm using an XSL to generate the content div of a page. I'm using
http://script.aculo.us to do some asynch posting and getting so that I don't
actually have to have the server know what I've generated. The whole idea i
s
that the content is organic. That part is working. Except for one strange
thing... I'm not sure if this is an ASP.net thing, or something I just don't
know about the DOM. When I add sub-forms with just plain html form tags,
the first child form I add isn't recognized as a separate form. It's
contents are 'added' to the main form. I've worked around it by putting a
dummy do nothing form on the page in front of my other generated sub forms..
.
but what gives here? I know it's not my markup because if I reverse the
order of the generated forms, the FIRST sub-form on the page is always
'assimilated' in the aspNetform, I've tried everything to get this not to
happen, enclosing in divs, and even just making a page with nothing but
generated forms... same results every time. The first html form on the page
is ALWAYS added to the asp.net generated form, no matter what. Am I missing
something? (I find that every time I post here, I usually am)