Google Maps v3 – How to center using an address on initialize?

Well a simple solution could be to initialize the map in your codeAddress function:

var geocoder, map;

function codeAddress(address) {
    geocoder = new google.maps.Geocoder();
    geocoder.geocode({
        'address': address
    }, function(results, status) {
        if (status == google.maps.GeocoderStatus.OK) {
            var myOptions = {
                zoom: 8,
                center: results[0].geometry.location,
                mapTypeId: google.maps.MapTypeId.ROADMAP
            }
            map = new google.maps.Map(document.getElementById("map_canvas"), myOptions);

            var marker = new google.maps.Marker({
                map: map,
                position: results[0].geometry.location
            });
        }
    });
}

This should solve the problem.