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();
                }