CSS Validates, but doesn't appear in Firefox

I'm working on a new website, and I'm not particularly experienced with HTML and CSS. The code I have created passes the W3C CSS Validation service, but does not show up in Firefox. It works in IE7. I would really appreciate if someone with a bit more experience could take a look and see if they could determine if I have an error somewhere. Thanks!

the website is http://ego.psych.mcgill.ca/labs/koestner/

 

Well, this is strange. I thought it had to do with these lines:
<link rel="stylesheet" type="text/css" href="andreas02.css" media="screen,projection" />
<link rel="stylesheet" type="text/css" href="print.css" media="print" />

while Opera and Safari have no trouble either.

Now on my old FF1.5 there are no errors given with the web development toolbar, but with FF2 I get this:
The stylesheet http://ego.psych.mcgill.ca/labs/koestner/andreas02.css was not loaded ecause its MIME type, "text/plain", is not "text/css".

Same error for the print.css

Now you are clearly stating this in the HTML, so I wonder if there's something either with your server, or you saved them in your HTML editor wrong.

Why FF thinks this and no other browser, I have no clue.