Header help

Hi, I run a Wordpress site and I use a logo instead of text for my header. I'm having a lot of difficulty figuring out how to get the header to link back to the main page. I really don't know much about PHP so I just do what I can. Please help! The site is GameRumors.net



header.php --

---------------------------------

style.css --

/* header */
.header {
background: url('img/logo.jpg') center top no-repeat;
border-bottom: 1px solid #EEE;
height: 104px;
width: 601px;
margin-bottom: 24px;
}
.header h1 {
background: url('img/logo.jpg') center top no-repeat;
color: #222;
font: normal 4em sans-serif;
margin-top: 40px;
text-align: center;
}

.header h1 a{
background: url('img/logo.jpg') center top no-repeat;
color: #222;
text-decoration:none;
}

.header h1 a:visited
{
color: #222;
text-decoration:none;
}

.header h2 {
border-top: 1px solid #EEE;
color: #666;
text-align: right;
}
.header h2 span {
background: #222;
color: #EEE;
padding: 0 6px;
}