// written by Dean Edwards, 2005
// with input from Tino Zijdel, Matthias Miller, Diego Perini
// http://dean.edwards.name/weblog/2005/10/add-event/
function addEvent(element, type, handler) {
(element.addEventListener) {
element.addEventListener(type, handler, false);
} {
// assign each event handler a unique ID
(!handler.$$guid) handler.$$guid = addEvent.guid;
// create a hash table of event types for the element
(!element.events) element.events = {};
// create a hash table of event handlers for each element/event pair
var handlers = element.events[type];
(!handlers) {
handlers = element.events[type] = {};
// store the existing event handler ( there is _disibledevent= true;
};