Topic: Any way to reduce the size of thumbnails??

I have finally successfully inserted simpleviewer webpics inside a frame on an existing webpage.  My dillema is such: i.e.    I have about 26 images that I am showing and I have rows of 6 with 2 columns showing at one time.  I tried going with 1 column with 6 rows, but then there must have been a bug in the program and it would not show all my images.  The little arrow shows that there is not anymore images when in fact there is.  So when I went to 2 columns I could see all my images.  So because I had to go with 2 columns, that reduced the size the horizontal big images could open up as.  I would like to make the thumbnails very small as to not take up much room.  Is there any way to do this??