IE displaying skin wrongly

[Snetty]

Lo all, I made a skin for a client's site a while back and i've just noticed a minor problem in IE. The site can be found at www.thecarshowcase.com.

If you view it in FF then you'll see that the logo/banner at the top displays with no problems. However, in IE it shows a white line in the background.

Here is the code. You'll see that the banner is made up of a large image as the background and an identical but cropped image as the link.

PHP Code:

<!-- logo -->
<a name="top"></a>

<div id="logo"><a href="http://www.thecarshowcase.com/forums/" style="border: none;"><img src="images/main/logo1link.png" style="border: none;" alt="The Car Showcase" /></a>
</div>
<!-- /logo --> 


PHP Code:

div#logo {
height: 174px;
width: 100%;
background: url(images/main/logo1.png) no-repeat left;
border: none;
margin: 0px;
padding: 0px;
} 


Can anyone see where my problem might be?