function swap(targetId,buttonId)
{
  if (document.getElementById)
        {
        target = document.getElementById(targetId);
  	    buttonName = document.getElementById(buttonId);
      if (target.style.display == "none")
                   {
                   target.style.display = "block";
                   }
               else
                  {
                   target.style.display = "none";
                   }
		if (target.style.display == "none")
                   {
                   buttonName.src = "/gfx/closed.gif";
                   }
                   else
                  {
                   buttonName.src = "/gfx/open.gif";
                   }
        }
}