I think your mistake is that your pictures aren't in the right folders.
For example you put a background image in the #container div like this: background: url("assignments/images/websitebackground1.jpg") repeat scroll 0 0 transparent;
but the image doesn't exist in the folder if you follow the path: Click Here
So in your server the css file is portfoliocss.css and it is not in a folder so you do not need to put in front of assignments the dots: ../assignments/images/websitebackground1.jpg
But what you need is to look if the folder assignments exists and inside the assignments folder if folder images exists with the photo websitebackground1.jpg.
And delete from the portfolio.css the line 4: <style type="text/css">
I hope it is helpful.
by johny_mplayer: mistake in the posted link