$.clientSize = function() {
    var dimensions = { width: 0, height: 0 };
    if (document.documentElement) {
        dimensions.width = document.documentElement.offsetWidth;
        dimensions.height = document.documentElement.offsetHeight;
    } else if (window.innerWidth && window.innerHeight) {
        dimensions.width = window.innerWidth;
        dimensions.height = window.innerHeight;
    }
    return dimensions;
}