You can not do that...
via css the URL you put on the background-image is just for the image.
Via HTML you have to add the href for your hyperlink in this way:
<a href="http://home.com" id="logo">Your logo</a>
With text-indent and some other css you can adjust your a element to show just the image and clicking on it you will go to your link.
EDIT:
I'm here again to show you and explain why my solution is much better:
<a href="http://home.com" id="logo">Your logo name</a>
This block of HTML is SEO friendly because you have some text inside your link!
How to style it with css:
#logo {
background-image: url(images/logo.png);
display: block;
margin: 0 auto;
text-indent: -9999px;
width: 981px;
height: 180px;
}
Then if you don't care about SEO good to choose the other answer.