var timer;

function set_position(num_menu)
{
  menu_1_x = 300;
  menu_2_x = 100;
  menu_1_y = 124;
  menu_2_y = 124;
  eval('document.all["menu_'+num_menu+'"].style.left = document.body.clientWidth/2-menu_'+num_menu+'_x');
  eval('document.all["menu_'+num_menu+'"].style.top = menu_'+num_menu+'_y');
}

function show_menu(num_menu)
{
  if (timer) clear_timer();
  hide_all();
  set_position(num_menu);
  eval('document.all["menu_'+num_menu+'"].style.visibility="visible"');
}

function hide_menu(num_menu)
{
  eval('document.all["menu_'+num_menu+'"].style.visibility="hidden"');
}

function hide_all()
{
  document.all["menu_1"].style.visibility = "hidden";
  document.all["menu_2"].style.visibility = "hidden";
}


function start_timer()
{
  timer=setTimeout("hide_all()",500);
}

function clear_timer()
{
 clearTimeout(timer);
}