65         addEvent: function(eventName, callback) {  argument
75             storeCallback(eventName, callback, target_id);
78             if (eventName != 'ready') {
79                 postMessage('addEventListener', eventName, element);
81             else if (eventName == 'ready' && isReady) {
93         removeEvent: function(eventName) {  argument
101                 removed = removeCallback(eventName, target_id);
104             if (eventName != 'ready' && removed) {
105                 postMessage('removeEventListener', eventName, element);
200     function storeCallback(eventName, callback, target_id) {  argument
205             eventCallbacks[target_id][eventName] = callback;
208             eventCallbacks[eventName] = callback;
215     function getCallback(eventName, target_id) {  argument
217             return eventCallbacks[target_id][eventName];
220             return eventCallbacks[eventName];
224     function removeCallback(eventName, target_id) {  argument
226             if (!eventCallbacks[target_id][eventName]) {
229             eventCallbacks[target_id][eventName] = null;
232             if (!eventCallbacks[eventName]) {
235             eventCallbacks[eventName] = null;