javascript show show for n ms animation

gistfile1.js

window.fn.showFor = function (jqSelector, fadeOutTimeMs, fadeInTimeMs) {
    // usage: rosetta.fn.showFor('#element-id', 5000) // shows #element-id for 5 seconds, then slow fades out

    if (! fadeInTimeMs) { fadeInTimeMs = 1000; }
    if (! fadeOutTimeMs) { fadeOutTimeMs = 5000; }
    $(jqSelector).removeClass('hidden').fadeIn(parseInt(fadeInTimeMs));


    setTimeout(function () {
        $(jqSelector).fadeOut(1000, function () {
            $(jqSelector).addClass('hidden');
        });
    }, parseInt(fadeOutTimeMs));
};