function addEvents() {
    var selector = document.getElementById('map-selector');
    var items = selector.getElementsByTagName('a');
    for (var i=0; i < items.length; i++) {
        var link = items[i];
        link.number = 'l' + i;
        link.onmouseover = showLocation;
        link.onmouseout = hideLocations;
    }
}

function showLocation() {
    hideLocations();
    var location = document.getElementById(this.number);
    location.style.display = 'block';
}

function hideLocations() {
    var items = d.getElementById('locations').getElementsByTagName('p');
    for (var i=0; i < items.length; i++) {
        var location = items[i];
        location.style.display = 'none';
    }
}

if (dom) {
    addEvents();
}