Photo Gallery Tutorial a lil help

Hey all I just finished reading through the two gallery tutorials on this site the first here and the second to add thumnails to the gallery found here

I just had two questions on how to modify the gallery. The first question is in the begining of the add thumbnails tutorial its shows and option to display the thumbnails in a grid. I was wondering how would I go about making that grid totally lost any help to achieve this would be great. Is it possible to get the thumnails to be listed in the list box component.

My second question is I know how the description text of each image is called. But I wanted to create a pop up buble graphic that if you rolled over and information icon it would display the pop up graphic with description to the corresponding image.

Last quick question how do i change the width and height of the thumbnail images inside the scroller.

Thanx for any help