var strOldPreId = null;
function show(strPreId){
  if(strPreId != strOldPreId){
    if(strOldPreId != null){
      document.getElementById(strOldPreId+"_toggle").style.display = "none";
      document.getElementById(strOldPreId+"_link").style.display = "";
    }
    document.getElementById(strPreId+"_toggle").style.display = "block";
    document.getElementById(strPreId+"_link").style.display = "none";
    strOldPreId = strPreId;
  }else{
    document.getElementById(strPreId+"_toggle").style.display = "none";
    document.getElementById(strPreId+"_link").style.display = "";
    strOldPreId = null;
  }
}

var date = new Date();
var year = date.getFullYear();