Sending data using the POST method.

Hello, I am a beginner programmer and I am trying to do the following: I have a commercial script (catalog.php) which accepts variables using the "POST" method. This script, however, is not designed to handle form fields other than "textfield". I have an intermediate script (translate.php) which reads variable from a form and creates a query string. If I wanted to call the original catalog script to process my translate.php query string using GET I would do "translate.php?<query-string>." However, because it uses the POST method, I do not know how to send the variables. Any ideas? Thanks so much, Guillermo Scharffenorth