SAP Script -Removing Blank Space

I am working on Customer Accounting Stmt.

On First Page I have to display header window , main window , account and footer window

Account window will be displayed on last page only.

Account window is phisically present after main window.

So blank space is getting created after main window.

My question is how to remove this blank space?

How to change the main window size dynamically?

Or any other solution to this problem?