this.events.triggerEvent("visibilitychanged"); 
    setVisibility: function(visibility, noEvent) {        if (visibility != this.visibility) {            this.visibility = visibility;            this.display(visibility);            this.redraw();            if ((this.map != null) &&                 ((noEvent == null) || (noEvent == false))) {                this.map.events.triggerEvent("changelayer");            }        }    },
2032	/local1/tlutelli/issta_data/temp/all_js/javascript/2007_temp/2007/2032/0e8e7ab620ec81e0909f04e0a03025090b347ff8/Layer.js/clean/lib/OpenLayers/Layer.js