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.position = 'relative'; footerElement.style.top = (windowHeight - (contentHeight + footerHeight)) + 'px'; }
            else { footerElement.style.position = 'static'; }
        }
    }
}

//window.onload = function() { setFooter(); }
//window.onresize = function() { setFooter(); }