Firefox 3.0 does not display images in embedded web page

Firefox 3.0 does not display images in embedded web page

On testing Firefox 3.0 with my application (webpage with embedded Zoho database), the images that were being displayed in Firefox 2.4 no longer appear when I am logged out of Zoho. The application can be viewed here www.edinburghrc.co.uk/about/equipment/equipment-inventory

Any help with correcting this would be most welcome.

Regards
Graham