Código:
var marker = new OpenLayers.Marker(EPSG, icon);
// popup
marker.events.register("click", marker, function(e){
popup = new OpenLayers.Popup.FramedCloud(data.idunidad,
marker.lonlat,
new OpenLayers.Size(200,200),
'<p>Info HTML</p>',
null,true);
});




