function findPosX(obj)
{
  var curleft = 0;
  if (obj.offsetParent)
  {
    while (obj.offsetParent)
    {
      curleft += obj.offsetLeft
      obj = obj.offsetParent;
    }
  }
  else if (obj.x)
    curleft += obj.x;
  return curleft;
}

function findPosY(obj)
{
  var curtop = 0;
  if (obj.offsetParent)
  {
    while (obj.offsetParent)
    {
      curtop += obj.offsetTop
      obj = obj.offsetParent;
    }
  }
  else if (obj.y)
    curtop += obj.y;
  return curtop;
}

function afficheMenu(menu)
{
    objMenu = document.getElementById(menu);
    imgMenu = document.getElementById("image"+menu);
    objMenu.style.left = findPosX(imgMenu);
    objMenu.style.top = findPosY(imgMenu)+imgMenu.height/2+1;

    objMenu.style.visibility = 'visible';
}
function afficheSubMenu(menu,parent)
{
    objMenu = document.getElementById(menu);
    parentMenu = document.getElementById(parent);
    objMenu.style.left = 110;
    objMenu.style.top = findPosY(parentMenu)-76;

    objMenu.style.visibility = 'visible';
}
function masqueMenu(menu)
{
    objMenu = document.getElementById(menu);
    objMenu.style.visibility = 'hidden';
}