function simple() {
  document.getElementById("simple").style.display = "block";
  document.getElementById("advanced").style.display = "none";
  
  document.getElementById("simpleLink").style.display = "none";
  document.getElementById("advancedLink").style.display = "block";
  
  //document.getElementById("simple-button").className = "toggle selected";
  //document.getElementById("advanced-button").className = "toggle unselected";
}
function advanced() {
  document.getElementById("simple").style.display = "none";
  document.getElementById("advanced").style.display = "block";

  document.getElementById("simpleLink").style.display = "block";
  document.getElementById("advancedLink").style.display = "none";
  
  //document.getElementById("simple-button").className = "toggle unselected";
  //document.getElementById("advanced-button").className = "toggle selected";
}
function all_run() {
  var state = document.getElementById("all-run").checked;

  document.getElementById("marathon").checked = state;
  document.getElementById("half-marathon").checked = state;
}
function all_tri() {
  var state = document.getElementById("all-tri").checked;
  document.getElementById("ironman").checked = state;
  document.getElementById("half-ironman").checked = state;
  document.getElementById("olympic").checked = state;
  document.getElementById("sprint").checked = state;
  document.getElementById("super-sprint").checked = state;
}