Headings-subheadings in ALV

Hi

I want to display a heading like JAN-06 and under that i want to display sub headings lik EE ER .

I used

form top_of_page.

clear wa_header.

wa_header-typ = 'H'.

wa_header-info = 'JAN-06'.

append wa_header to i_header.

endform.

its displaying,but i its displaying at first..i want in the middle ..

i already declared subheadings in fieldcatalog,now i want that JAN-06 top of those sub headings.

Its very urgent and can anyone give suggestion plz