Google Maps help - showing multiple addresses on single map

Question

I need a hand with my google maps code...

Basically what I want to do is display multiple addresses on a single map. I've got that part to work but I need to set-up the bounds and zoom so it zooms out/in and shows all the addresses in the map window...

My problem is after I run the setMapMarker() function in the load() function, I need to pull out the latitude and longitude from the geocoder that is run in the setMapMarker() function... however I can't seem to get it to return those details because the coordinates are pulled in the geocoder function...

I hope I'm making sense....

When I use the following code:

cords = setMapMarker(i, businesses[i].address);
alert(cords);

It alerts saying 'undefined' instead of the latitude...

My code below:

<script type="text/javascript">

var map;
var bounds;
var gmarkers = [];
var htmls = [];
var businesses = [ 
   { 
    address: '17/79 West Burleigh Rd, Burleigh Heads, Queensland 4220 Australia', 
    name: 'TEST' 
    }, 
    { 
     address: '39 Ellis Drive, Mudgeeraba, Queensland 4213 Australia', 
     name: 'TEST2' 
    }
];

function load() {
  if (GBrowserIsCompatible()) {
    map = new GMap2(document.getElementById("map"));
    map.addControl(new GLargeMapControl());
    for (var i = 0; i < businesses.length; i++) {
        cords = setMapMarker(i, businesses[i].address);
        alert(cords);
    }
    bounds = new GLatLngBounds();
    for (var i = 0; i < businesses.length; i++) {
      bounds.extend(new GLatLng(businesses[i].lat, businesses[i].lng));
    }    
    var latSpan = bounds.toSpan().lat();
    map.setCenter(bounds.getCenter(), map.getBoundsZoomLevel(bounds));
  }
}

function setMapMarker(i, address) {
    var marker;
    var geocoder;
    var place_lat;
    geocoder = new GClientGeocoder();
    geocoder.getLocations(address, function (response) {
     if (response && response.Status.code == 200) {
      place = response.Placemark[0];   
      var html = formatHtml("", address);
            marker = addMarker(place.Point.coordinates[1], place.Point.coordinates[0], html);
            map.addOverlay(marker); 
            place_lat = place.Point.coordinates[1];
     }
    });
    return place_lat;
}





/* OTHER CODE THAT I DON'T THINK IS NECESSARY FOR THIS QUESTION */




function formatHtml(blurb, address) {
    return '<div class="blurb">' + blurb + '</div>\n<div class="address">' + address + '</div>';
}

// handle clicks from the listing:
function click(i){
    gmarkers[i].openInfoWindowHtml(htmls[i]);
}

// set up a new marker
function addMarker(lat, lon, html){
    var marker = new GMarker(new GLatLng(lat, lon));
    GEvent.addListener(marker, "click", function() {
      marker.openInfoWindowHtml(html);
    });
    gmarkers.push(marker);
    htmls.push(html);
    return marker;
}

/* JQuery load function */

$(document).ready(function(){
    load();
});

</script>