$(window).bind("load resize", function() {
        var footerHeight = 0,
        footerTop = 0,
        footer = $("#footer");
        positionFooter();
        function positionFooter() {
            footerHeight = footer.height(); 
            footerTop = ($(window).height()-$("body").height() + footerHeight) + "px";
            footer.css({height: footerTop})
        }
    $(window).resize(positionFooter);
});