<p><a href="URL path to zipped file" title="Mouseover Description"><img style="width: XXpx; height: YYpx; border: 0;" src="Path to image" alt="Text Description"></a></p>

You can change the "p" tags to div tags and style as needed.

Or…

Between the head tags:

<style type="text/css">
#logolink {
display: block;
height: 100px;
width: 200px;
background-image: url(Path to your header image) no-repeat center scroll;
}

#bglink span {
display: none;
}
</style>

HTML:

<p><a id="logolink" href="http://whatever" title="Mouseover Description"></a></p><p><a id="bglink" href="#"><span>Click my logo</span></a></p>

Ron