fn.timing.js

// Throttle: only execute callback if more than 'ms' has passed since last successful call
var throttle = function (ms, func) {
    var last;
    return function () {
        var now = new Date();
        if (now - last < ms) {
            return;
        }
        func.apply(this, arguments);
        last = now;
    }
}

// Debounce: only execute callback after more than 'ms' has passed since last call
var debounce = function (ms, func) {
    var timer;
    return function () {
        var that = this;
        var args = arguments;
        window.clearTimeout(timer);
        timer = window.setTimeout(function () {
            func.apply(that, args);
        }, ms);
    }
}