function showhide(id) {
  if (document.getElementById) {
    if (document.getElementById(id).style.display
    == "block") {
      document.getElementById(id).style.display
      = "none";
    }else{
      document.getElementById("id0").style.display= "none";
      document.getElementById("id1").style.display= "none";
      document.getElementById("id2").style.display= "none";
      document.getElementById("id3").style.display= "none";
      document.getElementById("id4").style.display= "none";
      document.getElementById("id5").style.display= "none";
      document.getElementById("id6").style.display
      = "none";      document.getElementById("id7").style.display
      = "none";      document.getElementById("ido8").style.display
      = "none";      document.getElementById("ido9").style.display
      = "none";      document.getElementById("ido10").style.display
      = "none";
      document.getElementById(id).style.display
      = "block";
      document.getElementById("idt2").style.display= "none";
      document.getElementById("idt2").style.display= "none";
    }
  }
}