prototype_observe_extension.js

Element.addMethods({
    observeAll: function(element, eventHandlers){
        $H(eventHandlers).each(function(handler){
            Event.observe(element, handler.key, handler.value);
        });
    },
    stopObservingAll: function(element, eventHandlers){
        $H(eventHandlers).each(function(handler){
            Event.stopObserving(element, handler.key, handler.value);
        });
    }
});

Object.extend(document, {
    observeAll: Element.Methods.observeAll.methodize(),
    stopObservingAll: Element.Methods.stopObservingAll.methodize()
});

//Usage
$('element').observe({mouseup: myFunc, keyup: myFunc});