function at_show_aux(parent, child)
{
  var p = document.getElementById(parent);
  var c = document.getElementById(child );

  var top  = (c["at_position"] == "y") ? p.offsetHeight+2 : 0;
  var left = (c["at_position"] == "x") ? p.offsetWidth +2 : 0;

  for (; p; p = p.offsetParent)
  {
    top  += p.offsetTop;
    left += p.offsetLeft;
  }

  c.style.position   = "absolute";
  c.style.top        = top-40 +'px';
  c.style.left       = left+160 +'px';
  c.style.display    = "";
  //c.style.visibility = "visible";
}

// ***** at_show *****

function at_show()
{
  var p = document.getElementById(this["at_parent"]);
  var c = document.getElementById(this["at_child" ]);

  at_show_aux(p.id, c.id);
  clearTimeout(c["at_timeout"]);
}

// ***** at_hide *****

function at_hide()
{
  var p = document.getElementById(this["at_parent"]);
  var c = document.getElementById(this["at_child" ]);

  //c["at_timeout"] = setTimeout("document.getElementById('"+c.id+"').style.visibility = 'hidden'", 100);
  c["at_timeout"] = setTimeout("document.getElementById('"+c.id+"').style.display = 'none'", 100);
}

// ***** at_click *****

function at_click()
{
  var p = document.getElementById(this["at_parent"]);
  var c = document.getElementById(this["at_child" ]);

  //if (c.style.visibility != "visible") at_show_aux(p.id, c.id); else c.style.visibility = "hidden";
  if (c.style.display != "none") at_show_aux(p.id, c.id); else c.style.display = "none";
  return false;
}

function at_attach(parent, child, showtype, position, cursor)
{
  var p = document.getElementById(parent);
  var c = document.getElementById(child);

  p["at_parent"]     = p.id;
  c["at_parent"]     = p.id;
  p["at_child"]      = c.id;
  c["at_child"]      = c.id;
  p["at_position"]   = position;
  c["at_position"]   = position;

  c.style.position   = "absolute";
  //c.style.visibility = "hidden";
  c.style.display    = "none";
  c.style.zIndex     = "1001";
  
  if (cursor != undefined) p.style.cursor = cursor;

  switch (showtype)
  {
    case "click":
      p.onclick     = at_click;
      p.onmouseout  = at_hide;
      c.onmouseover = at_show;
      c.onmouseout  = at_hide;
      break;
    case "hover":
      p.onmouseover = at_show;
      p.onmouseout  = at_hide;
      c.onmouseover = at_show;
      c.onmouseout  = at_hide;
      break;
  }
}
function navLm(id,cls) {
var id=id; var cls=cls;
document.getElementById(id).className=cls;
}

var timeout         = 300;
var closetimer        = 0;
var ddmenuitem        = 0;

// open hidden layer
function mopen(id)
{
        // cancel close timer
        mcancelclosetime();

        // close old layer
        if(ddmenuitem) ddmenuitem.style.visibility = 'hidden';

        // get new layer and show it
        ddmenuitem = document.getElementById(id);
        ddmenuitem.style.visibility = 'visible';

}
// close showed layer
function mclose()
{
        if(ddmenuitem) ddmenuitem.style.visibility = 'hidden';
}

// go close timer
function mclosetime()
{
        closetimer = window.setTimeout(mclose, timeout);
}

// cancel close timer
function mcancelclosetime()
{
        if(closetimer)
        {
                window.clearTimeout(closetimer);
                closetimer = null;
        }
}

// close layer when click-out
document.onclick = mclose;