Viewing files:

Pictures: go to desired product/appilcation page and click on any image thumbnail. Big image will open.You can go through all pictures in a product/application gallery by pressing next/previous on the right/left near upper corner. Next/previous links will appear when you drag the mouse on top of the picture. You can close the image from "close" button in the bottom.

Video files: click the link, and your default mpeg player (such as Windows media player, Winamp or Real Player etc.) should play the file.
Leaflets: All leaflets are in PDF format. you will need Acrobat reader or similar program for viewing the PDF files.

Downloading files: 

Images: open a big image and save it by pressing right mouse button and "Save image as" when the cursor turns to an arrow (usually in the middle of the picture). With some browsers you may not be able to save images this way, try using Internet Explorer or Opera.

Video files: right click on the video link ans select "Save target as"

Leaflets & brochures: right click on the PDF link and select "Save target as"