Image Problem

Hey,

I have an image with a border but at the bottom there is a small gap between the bottom edge of the image and the actual border.

Why is it that there is a gap there?

HTML Code:
<div id="image">
<img src="images/spacer.jpg" alt="spacer" />
</div>

CSS Code:

#image{ margin: 10px 0 0 0; border: 1px solid #000; }