function addLoadEvent(func) {
  var oldonload = window.onload;
  if (typeof window.onload != 'function') {
    window.onload = func;
  }
  else {
    window.onload = function() {
      if (oldonload) {
        oldonload();
      }
      func();
    }
  }
}

function myPopup(url) {
  window.open( url,"myWindow","status=1,fullscreen=0,resizable=1,titlebar=yes" )
}

function makeLinks() {
  link1 = document.getElementById('spanOne');
  link2 = document.getElementById('spanTwo');
  link1.onclick = function() {
    myPopup('funstuff/elevator/ElevatorSim.html');
  }
  link2.onclick = function() {
    myPopup('funstuff/driving/index.html');
  }
}

addLoadEvent(makeLinks);