function swap(targetId,buttonId)
{
  
  if (document.getElementById)

        {
        target = document.getElementById(targetId);
        buttonName = document.getElementById(buttonId);
		}
            if (target.style.display == "none")
                {
                target.style.display = "";
                } 
            
            else 
                {
                target.style.display = "none";
                }
                
           
}