$(document).ready(function() {

            var positions = {
                'sw': 177,
                'se': 354,
                'london': 531,
                'east': 708,
                'central': 886,
                'wales': 1064,
                'nw': 1242,
                'ne': 1420,
                'scotland': 1598,
                'ni': 1776
            }

            var $image = $('img#regions');
            
            $('map#ukmap area').mouseover(function() {
                var position_string = '-' + positions[$(this).attr('id')] + 'px 0px';
                $image.css('background-position', position_string);
            });

            $('map#ukmap').mouseout(function() {
                $image.css('background-position', '0px 0px');
            });
        });