jsp to php and back again

[eric-yrHdaQSNc4gdnm+yROfE0A at public.gmane.org (Eric Chadbourne)]

i want to take the session variables in a jsp site and pass them to 
another site written in php.  i'm currently trying to use an html form 
and pass hidden session attributes to the php page via post.  i'm using 
javascript to automatically kick off the form.  at the moment i'm 
currently wrestling with getting this to work and it may be due to my 
ignorance of the fundamental nature of post.

i can think of a couple of other ways to get these sites to share info 
but i'm wondering what a big dog programmer would do.  tips welcome!

many thanks,
eric c.  the one who still horribly sucks with jsp / java.