Problem with a Nextgen gallery

Hi, I have a problem with a diaporama made with a Nextgen gallery. I created a diaporama and since then a text appeared : "The Flash Player and a browser..." as you can see in this link in french : http://www.unssmeuse.org/wordpress/?cat=3. I wanted to put this article in the slideshow provided by your theme, but the same message appeared on the slide. Is it possible to hide this text ?