I own a Google Apps domain, and I've built a site in google sites. Within the site I've embedded some gadgets, added by url.

The problem occurs when I open the site in Chrome: the gadgets aren't displayed and there's a white space instead of them. This doesn't happen when opening the site in Firefox.

Here's the difference. This is the page as displayed in Firefox

This is the page from Google Chrome, instead (without the gadgets)

How can I prevent this behavior? I'm aware that the gadgets loaded by an external url can be seen as non-secure items, but why chrome is blocking them at all?