Iframe not showing in Firefox

[fronaphoto]

Hello. First website, first time poster. I have a website, fronaphoto.com, that has an iframe with a photo gallery. The iframe works well in Iexplorer, but not Firefox. In Firefox, a horizontal line just shows up where the frame should be. However, when I open the local html files from my hard drive in Firefox, it works fine there too. The html has been validated.

[wysiwyg]

You're using a backslash in your links, they should all be forward slashes.

It's not just a horizontal line that's showing up, it's black text on a black background.

[fronaphoto]

Yes, perfect. Thanks!!