They look fine to me, too, and I’m using Firefox 11. However, you’ve uploaded absolutely huge images and are probably using the size reduction in the image editor. What you need to do is to resize your images to the maximum size of your theme’s post width, and then upload them. Or, if you want them to open to the larger size, you need to make sure that people don’t have to scroll. As it is they open to full size (on two clicks) so large that one has to scroll to see them.
Try that on at least one or two of your images and see if it makes any difference. If it doesn’t come back here and we’ll try to help you some more.
When I say ‘resize them’ I mean in an image editing program, before you upload them to your post or media library. You can use photoshop or you can’t afford that, Photoshop Elements is cheaper, or there is a free program called GIMP.
Thankyou both, I’m using firefox 14, aaah that’s the problem thanks yes they are too large to start with, thought my eyes had suddenly gone funny! I will go practice resizing, also will look at GIMP too :)