if (document.images)
  {
    menu_01_on = new Image;
    menu_01_off = new Image;
    menu_02_on = new Image;
    menu_02_off = new Image;
    menu_03_on = new Image;
    menu_03_off = new Image;
    menu_04_on = new Image;
    menu_04_off = new Image;
    menu_05_on = new Image;
    menu_05_off = new Image;
    menu_06_on = new Image;
    menu_06_off = new Image;
    menu_07_on = new Image;
    menu_07_off = new Image;
    menu_08_on = new Image;
    menu_08_off = new Image;
    menu_09_on = new Image;
    menu_09_off = new Image;
    menu_10_on = new Image;
    menu_10_off = new Image;
    menu_11_on = new Image;
    menu_11_off = new Image;
    menu_12_on = new Image;
    menu_12_off = new Image;
    menu_13_on = new Image;
    menu_13_off = new Image;
    
    cmenu_01_on = new Image;
    cmenu_01_off = new Image;
    cmenu_02_on = new Image;
    cmenu_02_off = new Image;
    cmenu_03_on = new Image;
    cmenu_03_off = new Image;
    cmenu_04_on = new Image;
    cmenu_04_off = new Image;
    cmenu_05_on = new Image;
    cmenu_05_off = new Image;
    
    lmenu_01_on = new Image;
    lmenu_01_off = new Image;
    lmenu_02_on = new Image;
    lmenu_02_off = new Image;
    lmenu_03_on = new Image;
    lmenu_03_off = new Image;
    lmenu_04_on = new Image;
    lmenu_04_off = new Image;
    lmenu_05_on = new Image;
    lmenu_05_off = new Image;
    
    menu_01_on.src = "images/menu/sub/menu_01_on.gif";
    menu_01_off.src = "images/menu/sub/menu_01.gif";
    menu_02_on.src = "images/menu/sub/menu_02_on.gif";
    menu_02_off.src = "images/menu/sub/menu_02.gif";
    menu_03_on.src = "images/menu/sub/menu_03_on.gif";
    menu_03_off.src = "images/menu/sub/menu_03.gif";
    menu_04_on.src = "images/menu/sub/menu_04_on.gif";
    menu_04_off.src = "images/menu/sub/menu_04.gif";
    menu_05_on.src = "images/menu/sub/menu_05_on.gif";
    menu_05_off.src = "images/menu/sub/menu_05.gif";
    menu_06_on.src = "images/menu/sub/menu_06_on.gif";
    menu_06_off.src = "images/menu/sub/menu_06.gif";
    menu_07_on.src = "images/menu/sub/menu_07_on.gif";
    menu_07_off.src = "images/menu/sub/menu_07.gif";
    menu_08_on.src = "images/menu/sub/menu_08_on.gif";
    menu_08_off.src = "images/menu/sub/menu_08.gif";
    menu_09_on.src = "images/menu/sub/menu_09_on.gif";
    menu_09_off.src = "images/menu/sub/menu_09.gif";
    menu_10_on.src = "images/menu/sub/menu_10_on.gif";
    menu_10_off.src = "images/menu/sub/menu_10.gif";
    menu_11_on.src = "images/menu/sub/menu_11_on.gif";
    menu_11_off.src = "images/menu/sub/menu_11.gif";
    menu_12_on.src = "images/menu/sub/menu_12_on.gif";
    menu_12_off.src = "images/menu/sub/menu_12.gif";
    menu_13_on.src = "images/menu/sub/menu_13_on.gif";
    menu_13_off.src = "images/menu/sub/menu_13.gif";
    
    cmenu_01_on.src = "images/menu/sub/cmenu_01_on.gif";
    cmenu_01_off.src = "images/menu/sub/cmenu_01.gif";
    cmenu_02_on.src = "images/menu/sub/cmenu_02_on.gif";
    cmenu_02_off.src = "images/menu/sub/cmenu_02.gif";
    cmenu_03_on.src = "images/menu/sub/cmenu_03_on.gif";
    cmenu_03_off.src = "images/menu/sub/cmenu_03.gif";
    cmenu_04_on.src = "images/menu/sub/cmenu_04_on.gif";
    cmenu_04_off.src = "images/menu/sub/cmenu_04.gif";
    cmenu_05_on.src = "images/menu/sub/cmenu_05_on.gif";
    cmenu_05_off.src = "images/menu/sub/cmenu_05.gif";
    
    lmenu_01_on.src = "images/menu/sub/lmenu_01_on.gif";
    lmenu_01_off.src = "images/menu/sub/lmenu_01.gif";
    lmenu_02_on.src = "images/menu/sub/lmenu_02_on.gif";
    lmenu_02_off.src = "images/menu/sub/lmenu_02.gif";
    lmenu_03_on.src = "images/menu/sub/lmenu_03_on.gif";
    lmenu_03_off.src = "images/menu/sub/lmenu_03.gif";
    lmenu_04_on.src = "images/menu/sub/lmenu_04_on.gif";
    lmenu_04_off.src = "images/menu/sub/lmenu_04.gif";
    lmenu_05_on.src = "images/menu/sub/lmenu_05_on.gif";
    lmenu_05_off.src = "images/menu/sub/lmenu_05.gif";
  }
  else
  {
    menu_01_on = "";
    menu_01_off = "";
    menu_02_on = "";
    menu_02_off = "";
    menu_03_on = "";
    menu_03_off = "";
    menu_04_on = "";
    menu_04_off = "";
    menu_05_on = "";
    menu_05_off = "";
    menu_06_on = "";
    menu_06_off = "";
    menu_07_on = "";
    menu_07_off = "";
    menu_08_on = "";
    menu_08_off = "";
    menu_09_on = "";
    menu_09_off = "";
    menu_10_on = "";
    menu_10_off = "";
    menu_11_on = "";
    menu_11_off = "";
    menu_12_on = "";
    menu_12_off = "";
    menu_13_on = "";
    menu_13_off = "";
    
    cmenu_01_on = "";
    cmenu_01_off = "";
    cmenu_02_on = "";
    cmenu_02_off = "";
    cmenu_03_on = "";
    cmenu_03_off = "";
    cmenu_04_on = "";
    cmenu_04_off = "";
    cmenu_05_on = "";
    cmenu_05_off = "";
    
    lmenu_01_on = "";
    lmenu_01_off = "";
    lmenu_02_on = "";
    lmenu_02_off = "";
    lmenu_03_on = "";
    lmenu_03_off = "";
    lmenu_04_on = "";
    lmenu_04_off = "";
    lmenu_05_on = "";
    lmenu_05_off = "";
    
    document.i_menu_01 = "";
    document.i_menu_02 = "";
    document.i_menu_03 = "";
    document.i_menu_04 = "";
    document.i_menu_05 = "";
    document.i_menu_06 = "";
    document.i_menu_07 = "";
    document.i_menu_08 = "";
    document.i_menu_09 = "";
    document.i_menu_10 = "";
    document.i_menu_11 = "";
    document.i_menu_12 = "";
    document.i_menu_13 = "";
    
    document.i_cmenu_01 = "";
    document.i_cmenu_02 = "";
    document.i_cmenu_03 = "";
    document.i_cmenu_04 = "";
    document.i_cmenu_05 = "";
    
    document.i_lmenu_01 = "";
    document.i_lmenu_02 = "";
    document.i_lmenu_03 = "";
    document.i_lmenu_04 = "";
    document.i_lmenu_05 = "";
  }
  
  function getStyleObject(id)
  {
	if (document.getElementById)
	{
	  return document.getElementById(id).style;
	}
	else if (document.layers)
	{
	  return document.layers[id];
	}
	  else if (document.all)
	{
	  return document.all[id].style;
	}
	else
	{
	  alert ("Your browser does not support DHTML features.");
	  return false;
	}
  }
  
  function show_course_menu()
  {
	var layerStyle = getStyleObject("course_menu");
	layerStyle.visibility = "visible";
  }
  
  function show_language_menu()
  {
	var layerStyle = getStyleObject("language_menu");
	layerStyle.visibility = "visible";
  }
  
  function hide_sub_menus()
  {
	var layerStyle = getStyleObject("course_menu");
	layerStyle.visibility = "hidden";
	var layerStyle = getStyleObject("language_menu");
	layerStyle.visibility = "hidden";
	
	document.i_menu_04.src = menu_04_off.src;
	document.i_menu_10.src = menu_10_off.src;
  }
  
  function showmap(i)
  {
	mapwindow = window.open( i , "map", "toolbar=0,location=0,directories=0,status=0,menubar=0,scrollbars=no,resizable=0,copyhistory=0,width=600,height=400");
	mapwindow.focus();
  }