Great!
Eric,
Thanks so much. Made the backup, opened up SiteAssist and made the modifications. Menu items and pages added without effecting images and CSS on the other pages.
One thing changed. Any adjustments to the CSS of the Menu Style is overwritten. I had altered the font size, width and placement of the menu title which is not that big of a deal to change back.
Thanks for your help, most appreciated!
All the best,
Thomas