var html = "<div style='width:12em'><b>Mulberry House</b><br />39 Manor Place<br />Edinburgh EH3 7EB </div>";
function initMap() {
      if (GBrowserIsCompatible()) {
         var map = new GMap2(document.getElementById('map_canvas'));
         var marker = new GMarker(new GLatLng(55.948791, -3.216333));
         
         map.setCenter(new GLatLng(55.948791, -3.216333), 15);
         map.addControl(new GSmallMapControl());
         map.addOverlay(marker);
         GEvent.addListener(marker, 'click', function() { marker.openInfoWindowHtml(html) }   )  ;
         marker.onclick=function(){
//	         marker.openInfoWindowHtml(html);
         }
         
       }
}