var overLink = function(link_name, link_name2){
  var curr = document.getElementById(link_name);
  var curr2 = document.getElementById(link_name2);
  
  curr.style.visibility = 'hidden';
  curr2.style.visibility = 'hidden';
}

var outLink = function(link_name, link_name2){
  var curr = document.getElementById(link_name);
  var curr2 = document.getElementById(link_name2);
  
  curr.style.visibility = 'visible';
  curr2.style.visibility = 'visible';
}

var showPart = function(part_show,part_hide){
  var show = document.getElementById(part_show);
  var hide = document.getElementById(part_hide);
  
  show.style.display = 'block';
  hide.style.display = 'none';
}

var over = function(original, over) {
  document.original.src = '_img/'+over;
}

var out = function(original, out) {
  document.images.original.src = '_img/'+over;
}