gistfile1.js

function callbackWrap(object, property, callbackArgNum, wrapperMaker, extra) {
    var original = object[property];
    object[property] = function() {
        arguments[callbackArgNum] = wrapperMaker(arguments[callbackArgNum], extra);
        return original.apply(this, arguments);
    }
    return original;
}

function performSelectorsWrapper(wrappedFunction) {
    return function() {
        wrappedFunction.apply(this, arguments);
        [[CPRunLoop currentRunLoop] performSelectors];
    }
}

setTimeoutOriginal = callbackWrap(window, "setTimeout", 0, performSelectorsWrapper);
setIntervalOriginal = callbackWrap(window, "setInterval", 0, performSelectorsWrapper);