[ultracomp]

Очень полезная вещь, вовремя нашел. У себя сделал так:

<script type="text/javascript" src="http://maps.google.com/maps/api/js?sensor=false"></script>

<script type="text/javascript">
var map;
var geocoder;
var marker;
//https://developers.google.com/maps/documentation/javascript/reference?hl=ru#MarkerOptions

 function initialize() {
    var center_map = new google.maps.LatLng(46.459856,30.731506);
    var myOptions = {
      zoom: 13,
      //center: center_map,
      mapTypeId: google.maps.MapTypeId.ROADMAP
    };
	map = new google.maps.Map(document.getElementById("map_canvas"), myOptions);
	geocoder = new google.maps.Geocoder(); // геокодер
	marker = new google.maps.Marker({ // маркер
                 visible: false,
                 map: map
             });
 }
function codeAddress(){
     var address = document.getElementById('adr').value;
     geocoder.geocode( { 'address':'Днепропетровск,'+address}, function(results, status) {
         if (status == google.maps.GeocoderStatus.OK) {
             map.setCenter(results[0].geometry.location);
             marker.setOptions({
             	visible: true,
             	title: address,
             	position: results[0].geometry.location
             });
             map.setZoom(17);
         } else {  
            alert('Geocode was not successful for the following reason: ' + status); 
        }
     });
 }
 </script>

<p>
        <input type="text" id="adr" value="Коцюбинского 2/4" />
        <input type="button" value="Geocode" onclick="codeAddress()">
      </p>
      <div id="map_canvas" style="width: 400px; height: 300px"></div>