void removeCallback(JSObject source,String method,boolean async){
  String key=source.toJSPointer() + "." + method;
  callbacks.remove(key);
  String js="delete " + source.toJSPointer() + "."+ method;
  exec(js,async);
}

void removeCallback ( JSObject source , String method , boolean async ) { String key = source . toJSPointer ( ) + "." + method ; callbacks . remove ( key ) ; String js = "delete " + source . toJSPointer ( ) + "." + method ; exec ( js , async ) ; }
removes a callback from a javascript object .
