rem: if (this.map != null) { 
add: if (visibility && this.map != null) { 
context:     setVisibility: function(visibility, noEvent) {        if (visibility != this.visibility) {            this.visibility = visibility;            this.display(visibility);            if (this.map != null) {                var extent = this.map.getExtent();                if (extent != null) {                    this.moveTo(extent, true);                }            }            if ((this.map != null) &&                 ((noEvent == null) || (noEvent == false))) {                this.map.events.triggerEvent("changelayer");            }        }    },
meta: 1027	/local1/tlutelli/issta_data/temp/all_js/javascript/2007_temp/2007/1027/4968e0e59c4803d378985dc0a37546b87b3935f2/Layer.js/clean/lib/OpenLayers/Layer.js