Page module & not displaying it

Hi all,

I’ve created this design with a big content-div on the left an some
small div’s on the right. These div’s on the right contain
“page-modules” that show up on some of the pages. But on some pages (for
example the loginscreen) these modules won’t get filled, so they should
disappear. That way the big content div will take up the whole screen.

What’s the best way to make these page-modules and to hide them? If a
module doesn’t get loaded, the div in the main layout should vanish, or
at least be displayed as :none.

Thanks in advance!