var name = "#floatingDiv";
var menuYloc = null;

$(document).ready(function () {
    menuYloc = parseInt($(name).css("top").substring(0, $(name).css("top").indexOf("px")))
    $(window).scroll(function () {
        offset = menuYloc + $(document).scrollTop() + "px";
        $(name).animate({ top: offset }, { duration: 500, queue: false });
    });
});