Different styles for screen and print

I have a mediawiki template for a photo "gallery" - basically 2 images 
sized to span the width of the page.  I am using mwlib / rl reports to 
generate pdfs from the wiki.

I need to have one format / size of the images for screen display and 
one for the pdf to make it appear correctly.

I have tried using various combinations of <div media="print" 
display="none"> and so on and it either displays in both screen and 
reports or neither.

Is anyone using mwlib / reportlab to create pdfs with different screen 
and report formatting?  How do I tell reportlab to ignore certain sections?

Thanks!