PHP Post data

[azteck2]

Hello everyone! New to Get Simple and really liking it so far. I have a problem getting some PHP to work though. My problem is I have a form asking for to values with a submit button. The form's action is set to go to a php file when the user clicks it. The php file then grabs the values entered in the form via the _post() command and then sets them to a variable. The file then performs some math on the variables and outputs the results to an echo command. All this works fine outside of Get Simple but as soon as I try to use the form from Get Simple I lose the post data. So I guess I'm asking how do I send the post data to this php file from Get Simple?
Thank you for the great product!
P.S. I attached the PHP files if anyone needs them to help me.