Replace header with image

If you would like to use an image instead of the text you have to replace the following code in header.php:

<div id="logo">
    <h1><a href="<?php echo get_option('home'); ?>/"><?php bloginfo('name'); ?></a></h1>
    <span id="blogDescription"><?php bloginfo('description'); ?></span>
</div>

with this:

<div id="logo">
    <a href="<?php echo get_option('home'); ?>/"><img src="link to image" alt="" title="" /></a>
</div>