function set_submenu(obj) {
    var nLeft,nTop
    ph = 28 // 서브메뉴 상단위치 조절
    nLeft = event.x - event.offsetX + document.body.scrollLeft;
    nTop = event.y - event.offsetY + document.body.scrollTop;

    eval(obj+".style").posLeft = nLeft - 3
    eval(obj+".style").posTop = nTop + ph;
    eval(obj+".style").display='block';
}

function show_submenu(obj) {
    eval(obj+".style").display='block';
}

function hide_submenu(obj) {
    eval(obj+".style").display='none';
}


  var save_layer = null;
function submenu_viewer(menu_id, opt)
{
 if (save_layer != null)
  save_layer.style.display = "none";
 
 if (opt == 'hide')
 {
  if (save_layer != null)
   save_layer.style.display = "none";
 } else {
  var menu = document.getElementById(menu_id);
  menu.style.display = 'block';
 }
 save_layer = menu;
}