[B]Tab Sequence problem with radio buttons[/B]

Hi,

I have membership type in application as
Select Membership type:
1 year(radio button)
2 year(radio button)
4 year(radio button)

Courier delivery:
courier(radio button)

currently tab sequence going from 1 year radiobutton to courier button
but tab sequence has to go as from 1 year to 2 year to 4 year to courier....
how can I do that in jsp page...could any one of you please suggest me ASAP.