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

function contentHeight() {
    if (document.getElementById) {
        var windowHeight = getWindowHeight();
        var containerHeight = document.getElementById('mainWrap').offsetHeight;
        var footerHeight = document.getElementById('footerWrap').offsetHeight;
        var footerElement = document.getElementById('footer-stretch');
        footerElement.style.height = (windowHeight - (containerHeight + footerHeight )) + 'px';
    }
}

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;
}