function constructIcon(url) {
    var icon = new GIcon();
    icon.image = url;
    icon.transparent = 'markers/purple-transparent.png';
    icon.shadow = 'markers/shadow.png';
    icon.iconSize = new GSize(19, 32);
    icon.iconAnchor = new GPoint(9, 31);
    icon.shadowSize = new GSize(51, 32);
    icon.imageMap = [ 12,0, 18,6, 18,13, 11,24, 10,31, 8,31, 7,24, 0,13, 0,6, 6,0 ];
    return icon;
}