Add a section

Hello All,

I wanted to add a module, in which thumbnails photoes are shown in horizental way of a album.

Example: In Photo gallery 2, First we have a list of album, And after click on the album the next page will show the photoes in the albums, and after click on the photo, it will show you the medium photo or the photo which you upload in the admin section with photo details, Here under that photo details i wanted to add new section which will displayed the thumbnail of the album in a row.
Please tell me how i can add this to my gallery 2 site.

Regards,
Pankaj