regions = ['nocn','york','wales','nw','wm','ne','em','ni','sw','se','eastern','london'];

function showRegions(id) {

    for (i=0 ; i < regions.length ; i++) {
        document.getElementById(regions[i] + '-region').style.display = 'none';
    }

    document.getElementById(id + '-region').style.display = 'block';

}