Can I provide map widget to foreign sites?

We whant to export map widget to the other sites. And most useful way to do this in foreign site - just connect comipel by GWT javascript from our server and write something like in google maps. Something like this:

<script type="text/javascript">
  function initialize() {
    var latlng = new google.maps.LatLng(-34.397, 150.644);
    var myOptions = {
      zoom: 8,
      center: latlng,
      mapTypeId: google.maps.MapTypeId.ROADMAP
    };
    var map = new google.maps.Map(document.getElementById("map_canvas"),
        myOptions);
  }

</script>

But this method use cross domain Ajax requests.

Can we easy create this API for our map with you instruments?