JQuery :: Background Image Swap On Hover Over Different Link

I'm trying to achieve an effect where background image will change once you hover over a different link, but not sure how to go about that...Here's what I got:

HTML
<ul id = "list">
<li id="home"><a href="#">HOME</li></a>
<li id="about"><a href="#">ABOUT</li>
<li><a href="#">PORTFOLIO</li>
<li><a href="#">WORK</li>
<li><a href="#">CONTACT</li>
<li><a href="#">GET A QUOTE</li>
</ul>

CSS
body {
background-image: url(Images/home.jpg);
} ul li {
list-style-type:none;
font-size:36px;
font-family:Impact, Charcoal, sans-serif;
} a:hover {
background-color:#7EB6FF;
-moz-border-radius: 15px;
border-radius: 5px;
width:40px;
} a:link {
text-decoration:none;
}

And JS should probably go something like this:
$("#about").hover(function() {
$(this).css("background-image", "url('Images/about.jpg')");
});

Though this only leads to image being show only partially (given that its li element only, I suppose).