function getPage1() {
    document.getElementById('page2').style.display="none";
    document.getElementById('page3').style.display="none";
    document.getElementById('page1').style.display="block";
  }

  function getPage2() {
    document.getElementById('page1').style.display="none";
    document.getElementById('page3').style.display="none";
    document.getElementById('page2').style.display="block";
  }

  function getPage3() {
    document.getElementById('page1').style.display="none";
    document.getElementById('page2').style.display="none";
    document.getElementById('page3').style.display="block";
  }