function xt_readmore(xt_id,xt_flg){
  var strName;
  var strName0;
  var strName1;
  if((xt_id=="")||(xt_id==null))return true;
  strName=xt_id;
  strName0 = "-" + strName;
  strName1 = "+" + strName;
  if(xt_flg==0){
    document.getElementById(strName0).style.display="none";
    document.getElementById(strName1).style.display="block";
  }else{
    document.getElementById(strName1).style.display="none";
    document.getElementById(strName0).style.display="block";
  }
  return true;
}