function sfield_view(id){ if( document.getElementById(id).style.display != "block" ){  document.getElementById(id).style.display="block"; }else{  document.getElementById(id).style.display="none"; }}
<!-- ここからmemo・ボタンチェンジ用 -->
function sfield_btn_vcng(id, str_close, str_open){
 var vid=id+"o";
 if( document.getElementById(id).style.display != "block" ){
  document.getElementById(id).style.display="block";
  document.getElementById(vid).value=str_close;
 }else{
  document.getElementById(id).style.display="none";
  document.getElementById(vid).value=str_open;
 }
}