Centering Images With CSS

Here is the first img:

If you are viewing this in Firefox, those three images will create one perfectly centered, two-pixel wide, vertical line (as it should). But in Internet Explorer, the bottom two images move to the left one pixel.... I would ask Micro, "Why?" But I'm sure I wouldn't get an answer.

NOTE: This Entry is being used by this blog post: http://websitedesign.ashtonsanders.com/2007/03/css-difficulties.html

Please link to the blog post, not this page.

Thank You,
-Ashton Sanders
-www.Websitesinaflash.com