nextgen slideshow doesn't display

I’m trying to get a nextgen slideshow to display on a page.
It displays ok at this link: http://hansonweb.net/itradphilly/photo-galleries/
But when I click on the menu item for my photo galley page the address that shows in the browser window is:
and then the slideshow won’t display. It seems to have something to do with the /#! that’s added into the page address. Anyone know what’s going on here? – Thanks