How exactly do you want it positioned? Your basic method is correct. Just play around with values to the bottom property. It takes positive and negative numbers depending on the direction you want to move it.
As far as a link: I assume you want the image to be a link. The way I would do it is to make the image the background of the link and then change it on hover. For example:
Code:
a.up {
display:block;
height:48px;
width:48px;
background: #FFF url(up.png) no-repeat top center;
}
a.up:hover {
background-image: url(down.png);
}
HTML Code:
<div>
<a href="#"> </a>
</div>
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