map.dataLayer = new OpenLayers.Layer("<%= I18n.t 'browse.start_rjs.data_layer_name' %>", { "visibility": false });
map.dataLayer.events.register("visibilitychanged", map.dataLayer, toggleData);
map.addLayer(map.dataLayer);
map.dataLayer = new OpenLayers.Layer("<%= I18n.t 'browse.start_rjs.data_layer_name' %>", { "visibility": false });
map.dataLayer.events.register("visibilitychanged", map.dataLayer, toggleData);
map.addLayer(map.dataLayer);