function realHeight(d){
    var maxSize = 0;
    if(d.offsetHeight){
        maxSize=d.offsetHeight;
    }
    else if(d.style.pixelHeight){
        maxSize=d.style.pixelHeight;
    }
    return(maxSize);
}

function realWidth(d){
    var maxSize = 0;
    if(d.offsetWidth){
        maxSize=d.offsetWidth;
    }
    else if(d.style.pixelWidth){
        maxSize=d.style.pixelWidth;
    }
    return(maxSize);
}

function windowHeight(){
    if(window.innerHeight) {
        return(window.innerHeight);
    }
    return(document.body.offsetHeight);
}

function windowWidth(){
    if(window.innerWidth) {
        return(window.innerWidth);
    }
    return(document.body.offsetWidth);
}