Cpa Iframe project

This is not a iframe project but what the script is ment to do is similar to a iframe. What I need is a script that allows me to take a webpage, in this case a cpa form, and display only part of the form on my website just like a iframe(i need to be able to adjust how much of the actual form is shown on my webpage with page position/height/length) Then once the person fills out the form and hits the continue or submit button the script has to have preset page position/hight/length values for the second page of the form(these values need to be adjustable so I can use the script for different forms). But the information they entered from the first page of the form has to be able to post to the second page of the form being most cpa forms operate in this way.