addEvent

gistfile1.js

// http://gihyo.jp/dev/serial/01/crossbrowser-javascript/0007
var addEvent = (function () {
    if (document.addEventListener) {
        return function(node, type, handler) {
            node.addEventListener(type, handler, false);
        };
    } else if (document.attachEvent) {
        return function(node, type, handler) {
            node.attachEvent('on' + type, function (event) {
                handler.call(node, event);
            });
        };
    }
})();