What is the default template?

I want to edit the template of these pages:

1) m/avatar/

2) /photo/gallery/some_pic

i want to switch page_column_1 and page_column_2 divs.

how can i do this?

Thanks.

Your in D7 correct?  Need to post this question there please, so it doesn't confuse the newbies who are working with their D6 Sites.

Yes it's D7.

sorry.