Script problem

Hi experts,

I have to develope the Commercial Invoice for my client.

The format of the commercial invoice for US and the format of the Commercial Invoice for IRAN is completely different.so I developed the another script to print IRAN Invoice .So how to configure these two Scripts(forms) to print program?.

if I print US invoice then it will trigger form for US and if I print IRAN Invoice then it will trigger form for IRAN using same print print program so how to configure this?

Thanks in advance.