This demo shows how to use jQuery Fillmore to specifify the desired focus of a photo.
<script src="../lib/jquery-1.7.1.min.js"></script>
<script src="../jquery.fillmore.js"></script>
<script>
$('.fillmored.focus').fillmore( {
src: "pot-holder.jpg"
focusX: 75, // a number between 1 and 100, starting from left
focusY: 16 // ditto, starting from top
} );
</script>