Code change not changing page.

I made some changes to my wp-layout.css based on a tutorial at page http://www.tamba2.org.uk/wordpress/graphicalcss/header/index.html. It should have changed the header quite dramaticly, but it didn’t change at all. I deleted my temporary internet files and pressed the ctrl+f5 to be sure that the page was refreashing. I also had a friend check the page.
I am new to this and I didn’t expect it to be perfect, but I did expect to at least see something change-even if was all messed up. But, it’s exactly as it was before the changes.
What am I missing?
I changed:
#header {
background: #90a090;
border-bottom: double 3px #aba;
border-left: solid 1px #9a9;
border-right: solid 1px #565;
border-top: solid 1px #9a9;
font: italic normal 230% 'Times New Roman', Times, serif;
letter-spacing: 0.2em;
margin: 0;
padding: 15px 10px 15px 60px;
}
to:
#header {
background-image: url('fisherman.gif');
background-repeat: no-repeat;
border: solid 1px #000;
margin: 0;
height: 200px;
width: 718px;
}