Run the Design Checker, and you will see that you have overlapped many
elements which converts all those elements into a GIF:
http://www.wvonline.com/bhsindians/img0.gif

Use the Snap To function when arranging your page to avoid overlaps, but in
your case I would guess that it is your black background. This might be
coming from your Marguee, or some other place, but if you look at the bottom
of your page, you see your true background. Figure out where that black
color is coming from (Design Checker), and get rid of it. If you want a
black background, then go to Format > Color and Background Scheme > and look
at the bottom of the window to see where you change the background color.

DavidF