// JavaScript Document
// showlayer functions done with brute force
// (could use an array of these things to simplify 
// the code).
function showlayer1() {
  document.getElementById("layer1").style.display="block";
  document.getElementById("layer2").style.display="none";
  document.getElementById("layer3").style.display="none";
  document.getElementById("layer4").style.display="none";
  document.getElementById("layer5").style.display="none";
  document.getElementById("layer6").style.display="none";
  document.getElementById("layer7").style.display="none";
  document.getElementById("layer8").style.display="none";
  document.getElementById("layer9").style.display="none";
}
function showlayer2() {
  document.getElementById("layer1").style.display="none";
  document.getElementById("layer2").style.display="block";
  document.getElementById("layer3").style.display="none";
  document.getElementById("layer4").style.display="none";
  document.getElementById("layer5").style.display="none";
  document.getElementById("layer6").style.display="none";
  document.getElementById("layer7").style.display="none";
  document.getElementById("layer8").style.display="none";
  document.getElementById("layer9").style.display="none";
}
function showlayer3() {
  document.getElementById("layer1").style.display="none";
  document.getElementById("layer2").style.display="none";
  document.getElementById("layer3").style.display="block";
  document.getElementById("layer4").style.display="none";
  document.getElementById("layer5").style.display="none";
  document.getElementById("layer6").style.display="none";
  document.getElementById("layer7").style.display="none";
  document.getElementById("layer8").style.display="none";
  document.getElementById("layer9").style.display="none";
}
 function showlayer4() {
  document.getElementById("layer1").style.display="none";
  document.getElementById("layer2").style.display="none";
  document.getElementById("layer3").style.display="none";
  document.getElementById("layer4").style.display="block";
  document.getElementById("layer5").style.display="none";
  document.getElementById("layer6").style.display="none";
  document.getElementById("layer7").style.display="none";
  document.getElementById("layer8").style.display="none";
  document.getElementById("layer9").style.display="none";
}
 function showlayer5() {
  document.getElementById("layer1").style.display="none";
  document.getElementById("layer2").style.display="none";
  document.getElementById("layer3").style.display="none";
  document.getElementById("layer4").style.display="none";
  document.getElementById("layer5").style.display="block";
  document.getElementById("layer6").style.display="none";
  document.getElementById("layer7").style.display="none";
  document.getElementById("layer8").style.display="none";
  document.getElementById("layer9").style.display="none";
 }
  function showlayer6() {
  document.getElementById("layer1").style.display="none";
  document.getElementById("layer2").style.display="none";
  document.getElementById("layer3").style.display="none";
  document.getElementById("layer4").style.display="none";
  document.getElementById("layer5").style.display="none";
  document.getElementById("layer6").style.display="block";
  document.getElementById("layer7").style.display="none";
  document.getElementById("layer8").style.display="none";
  document.getElementById("layer9").style.display="none";
}
function showlayer7() {
  document.getElementById("layer1").style.display="none";
  document.getElementById("layer2").style.display="none";
  document.getElementById("layer3").style.display="none";
  document.getElementById("layer4").style.display="none";
  document.getElementById("layer5").style.display="none";
  document.getElementById("layer6").style.display="none";
  document.getElementById("layer7").style.display="block";
  document.getElementById("layer8").style.display="none";
  document.getElementById("layer9").style.display="none";
}
function showlayer8() {
  document.getElementById("layer1").style.display="none";
  document.getElementById("layer2").style.display="none";
  document.getElementById("layer3").style.display="none";
  document.getElementById("layer4").style.display="none";
  document.getElementById("layer5").style.display="none";
  document.getElementById("layer6").style.display="none";
  document.getElementById("layer7").style.display="none";
  document.getElementById("layer8").style.display="block";
  document.getElementById("layer9").style.display="none";
}
function showlayer9() {
  document.getElementById("layer1").style.display="none";
  document.getElementById("layer2").style.display="none";
  document.getElementById("layer3").style.display="none";
  document.getElementById("layer4").style.display="none";
  document.getElementById("layer5").style.display="none";
  document.getElementById("layer6").style.display="none";
  document.getElementById("layer7").style.display="none";
  document.getElementById("layer8").style.display="none";
  document.getElementById("layer9").style.display="block";
}