function getWindowHeight() {
        var windowHeight = 0;
        if (typeof (window.innerHeight) == 'number') {
            windowHeight = window.innerHeight;
        }
        else {
            if (document.documentElement && document.documentElement.clientHeight) {
                windowHeight = document.documentElement.clientHeight;
            }
            else {
                if (document.body && document.body.clientHeight) {
                    windowHeight = document.body.clientHeight;
                }
            }
        }
        return windowHeight;
    }
    function setFooter() {
        if (document.getElementById) {
            var windowHeight = getWindowHeight();
            if (windowHeight > 0) {
                var contentHeight = document.getElementById('content').offsetHeight;
                var footerElement = document.getElementById('footer');
                var footerHeight = footerElement.offsetHeight;
                if (windowHeight - (contentHeight + footerHeight) >= 0) {
                    footerElement.style.top = (windowHeight - (contentHeight + footerHeight)) + 'px';
                }
                else {
                    footerElement.style.top = '0px';
                }
            }
        }
    }
    window.onload = function() {
        setFooter();
    }
    window.onresize = function() {
        setFooter();
    }