var address = "862 Folsom Street, San Francisco, CA";
var address2 = "407 N. San Mateo Drive, San Mateo, CA";

var geocoder = new GClientGeocoder();

var map1 = new GMap2(document.getElementById("map_container1"));
geocoder.getLatLng(address, function(point) {
    map1.setCenter(point, 15);
    var marker = new GMarker(point);
    map1.addOverlay(marker);
});

var map2 = new GMap2(document.getElementById("map_container2"));
geocoder.getLatLng(address2, function(point) {
    map2.setCenter(point, 15);
    var marker = new GMarker(point);
    map2.addOverlay(marker);
});