function showhide(id){
  if(document.getElementById){
    if(document.getElementById(id).style.display == "none")
      document.getElementById(id).style.display = "block";
    else
      document.getElementById(id).style.display = "none";
  }
}
 function showhide0(id){
  if(document.getElementById){
    if(document.getElementById(id).style.display == "block")
      document.getElementById(id).style.display = "none";
    else
      document.getElementById(id).style.display = "block";
  }
}
 
function toggleVisibility(id){
  if(document.getElementById){
    if(document.getElementById(id).style.visibility == "hidden")
      document.getElementById(id).style.visibility = "visible";
    else
      document.getElementById(id).style.visibility = "hidden";
  }
}