// Find the height of the viewport
function windowHeight() {
    // A shortcut, in case we’re using Internet Explorer 6 in Strict Mode
    var de = document.documentElement;

    // If the innerHeight of the browser is available, use that
    return self.innerHeight ||

        // Otherwise, try to get the height off of the root node
        ( de && de.clientHeight ) ||

        // Finally, try to get the height off of the body element
        document.body.clientHeight;
}

// Find the width of the viewport
function windowWidth() {
    // A shortcut, in case we’re using Internet Explorer 6 in Strict Mode
    var de = document.documentElement;

    // If the innerWidth of the browser is available, use that
    return self.innerWidth ||

        // Otherwise, try to get the width off of the root node
        ( de && de.clientWidth ) ||

        // Finally, try to get the width off of the body element
        document.body.clientWidth;
}