Images not loading in Firefox/Chrome only in safari Options

[anotherstani]

Hi guys.

I am new to HTML and have been trying to customise a tumblr blog. I have done everything I need to do in Safari on my Mac. However, when the page loads in anything other than safari there are certain images that do not appear, not even any sign of anything where they should be.

I have made sure the images are RGB, I uploaded them to imgur, then copied the link and pasted it in the appropriate html code.
The offending images are under 'Find Me' and 'Friends'. It is strange as I have done the exact same thing with the header (upload to imgur, copy paste the link) and that is working fine.

Here is my site

http://www.indieshorts.tv

Any help would be great as I am pulling my hair out here as I am used to figuring things out myself.

Thank you

Mike