Dynamic Internal table in ALV format

Hi,

I have the internal table like the below one and there are 7 seven check-box in the selection screen which relates the seven fields in the internal table. If the user selects 5 check-box then the corresponding 5 fields has to be displayed in the output as ALV format. If he selects 2 check-box then the corresponding 2 fields has to be displayed in the output as ALV format. Please let me know how to do it?

Data : Begin of Lt_temp occurs 0,

f1,

f2,

f3,

f4,

f5,

f6,

f7,

end of lt_temp.

Thanks for your reply.

Best Regards,

Raj.