function DiagramA(){
document.getElementById('diagramA').style.display='block';
document.getElementById('DiagramAtext').style.display='none';
window.scrollTo(0,1000); // scroll as far down the page as we can
}
function DiagramB(){
document.getElementById('diagramB').style.display='block';
document.getElementById('DiagramBtext').style.display='none';
window.scrollTo(0,1000); // scroll as far down the page as we can
}