function showhide(id){
    if(document.getElementById){
      if(document.getElementById(id).style.display == "block"){
        document.getElementById(id).style.display = "none";
      }else{
        document.getElementById("id0_1").style.display = "none";

        document.getElementById("id1_1").style.display = "none";
        document.getElementById("id1_2").style.display = "none";
        document.getElementById("id1_3").style.display = "none";
        document.getElementById("id1_4").style.display = "none";
        document.getElementById("id1_5").style.display = "none";
        document.getElementById("id1_6").style.display = "none";
        document.getElementById("id1_7").style.display = "none";
        document.getElementById("id1_8").style.display = "none";
        document.getElementById("id1_9").style.display = "none";
        document.getElementById("id1_a").style.display = "none";

        document.getElementById("id2_1").style.display = "none";
        document.getElementById("id2_2").style.display = "none";
        document.getElementById("id2_3").style.display = "none";
        document.getElementById("id2_4").style.display = "none";
        document.getElementById("id2_5").style.display = "none";
        document.getElementById("id2_6").style.display = "none";
        document.getElementById("id2_7").style.display = "none";
        document.getElementById("id2_8").style.display = "none";
        document.getElementById("id2_9").style.display = "none";

        document.getElementById("id3_1").style.display = "none";

        document.getElementById(id).style.display = "block";
      }
    }
  }