Full size header not showing up

[lavondahoward]

Okay. I know I should upload the new header into my files for the site, but where exactly should it go? I put it in the images file, but when I changed the name of the file in the editor, I am getting a blank header. Am I doing this right? Please help!

/************************************************
* Header *
************************************************/

#header {
background: #111111 url(images/header.jpg) no-repeat;
width: 960px;
height: 200px;
margin: 0px auto 0px;
padding: 0px;
overflow: hidden;
}

#header p {
padding: 0px 0px 5px 10px;
margin: 0px;
line-height: 20px;
}

#header #imageheader {
width: 340px;
height: 200px;
text-indent: -10000px;
background:none;

}

#header #imageheader a {
display: block;
width: 340px;
height: 80px;
}