add: this.map.events.unregister("changebaselayer", this, this.updateAttribution); 
context:     destroy: function() {        this.map.events.unregister("removelayer", this, this.updateAttribution);        this.map.events.unregister("addlayer", this, this.updateAttribution);        this.map.events.unregister("changelayer", this, this.updateAttribution);                OpenLayers.Control.prototype.destroy.apply(this, arguments);    },    
meta: 1027	/local1/tlutelli/issta_data/temp/all_js/javascript/2007_temp/2007/1027/446759fd650e4b3c64a738f24b7dbd38891880ad/Attribution.js/clean/lib/OpenLayers/Control/Attribution.js