Header Image Link and Sidebar Issues

Two things I’d like to do (using default Kubrick template in WP 1.5):

1. Make my custom header image a link to the home page

Right now, in header.php I have this line:
#headerimg { background: url(‘<?php bloginfo(‘stylesheet_directory’); ?>/images/personalheader.gif’) no-repeat top;}

How do I make that image into a link? (I don’t know if this is what is screwing me up, but I set the display: none for these lines later in header.php:

<div id=”header”>
<div id=”headerimg”>
<h1 class=”invisible”>“><?php bloginfo(‘name’); ?></h1>
<div class=”invisible”><?php bloginfo(‘description’); ?></div>
</div>

2. How can I make the sidebar appear not just on the home page, but on permalink, category, and archive pages?

Thanks very much in advance for the help.