I'm stuck

i have thumbnails in one frame. I want to create a link from the thumbnail in
the one frame to a larger pic in the frame next to the thumbnails. In the
source field i have the thumbnail info. In the field i have the frameset info.
In the target field i have the right frame info. Do i put the larger pic in
the low source field? If not how do i set this up. I want to have thumbnails
in the left frame. When you click on a thumbnail the larger pic shows in the
right frame.:confused;