Images do not line up!

Hey, I am having a problem with images lining up when viewed in IE, I think I have got them to line up in FireFox, but in IE, when you view a comment page of a topic or anything, then the images wont line up, and probably on the main wordpress blog page. Does anyone know how to solve this problem please? Thanks in advanced.

PS. Heres the weblink of the blog: http://www.spackmonkeh.co.uk/wordpress/