If your using MS Office to make your power point projects then you should be able to save as with option for HTML
This turns the Power Point into a Web Page format for a browser to be able to display it.
Javascript is best for displaying a web page for a certain period of time and then displaying the next group of pages with time delay and then loop back to page 1 again. With powerpoint creating the HTML version of the slideshow you might have it counting say 1 to 5 and back to 1 again to loop the pages with time delay and have to use Anchors in HTML to specify the focus area of within the HTML webpage to display. Anchors are when your at a single website that the page scrolls, and you click on a link at the top of the page it instantly moves your view to the middle of the page placed as intended by the web designers intent with a paragraph or picture or whatever is to be displayed.
Someone will need some basic HTML knowledge and would have to maintain this. However with proper skills a person could code up an easy interface for management to look over the powerpoint presentation and approve it and click submit and it updates and code adjusts dynamically to display the latest data but making up a dynamically updated system like that would need a skilled programmer/web designer.
Last and easiest to avoid Anchors, but still requires editing by someone in HTML with Javascript would be to take the sides from power point and each slide saved as a image file such as a png or jpg file. The javascript then counts say 1 to 5 and loops back again and it loads image 1 waits 15 seconds and then 2, 3, 4, 5 and back to 1. As long as the image files are named say 1.jpg or 1.png all the way to say 5.jpg or 5.png and these image files are located in the same directory that the web page that the javascript is running or correct full URL path given for access to that image file on the local intranet it will work pretty easily.
If your using Powerpoint 2010 see this:
https://support.microsoft.com/en-us/kb/980553If you chose to save as images and go that route check out your save as selection. JPG and PNG are listed. JPG will be a smaller file, but not as sharp as PNG. With large displays you probably want PNG if you go this route.
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