Code Readability...

/* From: http://stackoverflow.com/a/1280279/1175714
 *
 * This is an easier-to-read version that extrapolates
 * from the very reasonable linux kernel coding style spec
 * https://www.kernel.org/doc/Documentation/CodingStyle
 *
 * - Outer-most functions are treated as functions and get a next-line brace
 * - Anything inside a function does not get a next-line brace.
 * - 4-space indent
 */

function setDeceleratingTimeout(callback, factor, times)
{
    var internalCallback = (function(tick, counter){
        return function(){
            if (--tick > 0) {
                window.settimeout(internalCallback, ++counter * factor);
                callback();
            }
        }
    })(times, 0);

    window.setTimeout(internalCallback, factor);
};

function test_setDeceleratingTimeout()
{
    function sayhi(){
        console.log("hi");
    }

    function saybye(){
        console.log("bye");
    }

    setDeceleratingTimeout(sayhi, 10, 10);
    setDeceleratingTimeout(saybye, 100, 10);
};

test_setDeceleratingTimeout();