function subMenu(show,submenu){
  if(show=='hide') {
    document.getElementById(submenu).style.visibility = 'hidden';
  } 
  if(show=='show') {
    document.getElementById(submenu).style.visibility = 'visible';
  }
}




var hide;
function showBox(show){
  if(document.getElementById("1").style.visibility == "visible") {
    hide = 1;
  }
  if(hide==null) {
    document.getElementById(show).style.visibility = 'visible';
    hide = show;
  } else {
    document.getElementById(hide).style.visibility = 'hidden';
    document.getElementById(show).style.visibility = 'visible';
    hide = show;
  }

}


function swapImg(imgSrc) {
  document.getElementById("swapImg").innerHTML = "<img src='"+imgSrc+"' alt='' />";
}