Thanks in advance for any advice

Having built a website for a client, we have found that when they use Contribute to modify a page, it causes the "wmode" "opaque" text applied to a Flash slideshow to disappear from the page source on publication.This means that once the new page is published, the spry menu used for navigation subsequently falls behind the slideshow directly beneath it.

Has anybody encountered anything similar with Contribute and if so, had any success at a permanent fix