Graphics, Figures & Tables ⇒ Watermark (image/no image)

[jezikk]

Hi,

I would like to make a watermark in the center of the page on which there is no picture, but if the image is placed on the page, I need to place a watermark in the header as here:
http://disk.jabbim.cz/jezikk@njs.netlab ... rmarks.PNG

Can you help me please?

Thank You

Jezikk