opening pdf file in new window with a POST operation

This is a strange one... <h1>test</h1> <form action="https://my.server/reports.php" method="post" target="_blank"> <input type=text value='1' name=pdf_client_num> <input type=text value='q1_2002' name=pdf_time_period> <input type=text value='reports' name=task> <input type=text value='pdf' name=report_type> <input type=text value='admin' name=u> <input type=submit value='Show PDF'> </form> <form action="https://my.server/reports.php" method="get" target="_blank"> <input type=text value='1' name=pdf_client_num> <input type=text value='q1_2002' name=pdf_time_period> <input type=text value='reports' name=task> <input type=text value='pdf' name=report_type> <input type=text value='admin' name=u> <input type=submit value='Show PDF'> </form> These forms are identical with the exception of the post/get methods. A PDF file is being dynamically generated and displayed in a pop-up. The GET method form works fine, while the POST method (which is what I need to use) pops up a message about the page containing both secure and nonsecure data. WTF? Any help out there? Thanks in advance, Pete.