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// observable is a DOM node, document, window, etc.
// eventName is the string event name, say "load" or "click"
// handler is the callback function.
function addEventListener(observable, eventName, handler) {
        if ( observable.addEventListener ) {
                observable.addEventListener(eventName, handler, false);
        } else if ( observable.attachEvent ) {
                observable.attachEvent("on" + eventName, handler);
        } else {
                // error handling?
        }
}