Image Logo

[Picasso]

Hello everyone!
How can I add a image logo in Innovation theme style.css?
Perhaps I need to change something in the block?:

Code:

/* HEADER: logo */
header #logo {
    position:absolute;
    top:20px;
    left:0;
    font-size:35px;
    white-space:nowrap;
    color:#fff;
    font-family: 'Yanone Kaffeesatz', arial, helvetica, sans-serif;
    text-transform:uppercase;
    text-shadow: 1px 1px 0px rgba(0,0,0, .4);
}
header #logo:link,
header #logo:visited,
header #logo:hover,
header #logo:focus {
    text-decoration:none;
}