<script type="text/javascript" language="Javascript">

    $(function(){
        $('#cropbox').Jcrop({
            aspectRatio: 100/70,
            minSize: [200, 140],
            bgColor:     'pink',
                        bgOpacity:   .2,
            onChange: showCoords
        });
    });

    function showCoords(c){
        $('#x1').val(c.x);
        $('#y1').val(c.y);
        $('#x2').val(c.x2);
        $('#y2').val(c.y2);
        $('#w').val(c.w);
        $('#h').val(c.h);
    }

</script>