If the page has something like:
<form method="post" action=(your servlet here) name="theForm">
you can submit it at page load by making the body tag of the page :
<body onLoad="document.theForm.submit()">
I'm not sure what you mean by "TAG at both ends" - your servlet (as specified in the action of your <form> tag needs to have a doPost() method that handles the post.
Success Ton