function showddp(id) 
{
 ddp = document.getElementById(id);
 if(ddp.style.visibility == "hidden")
 {
  ddp.style.display = "block";
  ddp.style.visibility = "visible";
 }
  else
 {
  ddp.style.display = "none";
  ddp.style.visibility = "hidden";
 }
}