• Place for example the slideshow widget "basic" on your page.
• Click onto the small blue arrow top right of the widget to show the configuration panel
• Deselect prew, next, counter, captions and activate "full screen".
• With "add images" load the images you want to show
The full screen slideshow is ready to work
Now place a white rectange onto the slideshow and you have, what you are looking for. If you do all these steps on a master page, the slideshow appears on every page you add to your site.