var registered = [];

// window.onload = function () {
//   document.body.onmousedown = hidePopUp
// }
// 
function reveal(pop_name) {
 clearRegistered();
 var posx = 0;
 var posy = 0;
 var e = window.event;
 popDiv = document.getElementById(pop_name);
 popDiv.style.display = 'block'
 registered.push(popDiv);
}

// function hidePopUp(e) {
//  
//   if (registered.length > 0) {
//     if (!e) {e = window.event}; 
//     // alert('lalalal')
//     if (e.target && ! (e.target.tagName == 'A' || e.target.className == 'art_image')) {
//       clearRegistered();
//     }
//   }
// }

function swapImages(e, new_image, selected) {
  var targ
  if (!e) var e = window.event
  if (e.target) targ = e.target
  if (targ && !selected) targ.src = new_image
}

function clearRegistered() {
  while (registered.length > 0) {
    registered[0].style.display = 'none';
    registered.shift();
  }
}