/*whatision.js*/
var cpage = 1;
window.onload = initset;

function initset() {
var npage = "part" + cpage;
document.getElementById(npage).style.display = "block";
}

function nxtpage(npagenum){
  var npage = "part" + cpage;
  document.getElementById(npage).style.display = "none";
  cpage = npagenum;
  npage = "part" + cpage;
  document.getElementById(npage).style.display = "block";
}

function nextpge(){
  var npage = "part" + cpage;
  document.getElementById(npage).style.display = "none";
  cpage = cpage + 1;
  if (cpage < 5){
  npage = "part" + cpage;
  document.getElementById(npage).style.display = "block";
  } else {
  cpage = 1;
  npage = "part" + cpage;
  document.getElementById(npage).style.display = "block";
  }
  }