Create a DIV that an image can go in then position it around accordingly, like this:
CODE
<style>
.image {position: absolute; top: #px; left: 50%; margin-left: #px; z-index: 9;}
</style>
<div class="image">
<img src="URL" alt="" />
</div>
Replace the pound symbols with appropriate values to move it and URL with your image's url.