Some pictures aren't loading

Hello. I'm not quite sure what version 5 of Drupal I'm running but here's my problem. I'm using the news aggregator to present content from another website. The problem is that some pictures can be viewed but some can't. I have worked out that the pictures that can't be viewed are being referenced as being on my server, and not on the webite of the originator. You can see the problem on the homepage here www.ad-mad.co.uk
Is there something I can do to fix it or is it a problem at the originators website (who also uses Drupal)?

Thanks in advance

Steve