function expand(URI,SUB,EXP){
  if(document.getElementById) {
    if(document.getElementById(SUB).style.display) {
      if(URI != 0) {
        document.getElementById(SUB).style.display = "block";
        document.getElementById(EXP).style.display = "none";
      } else {
        document.getElementById(SUB).style.display = "none";
        document.getElementById(EXP).style.display = "block";
      }
    } else {
      location.href = URI;
      return true;
    }
  } else {
    location.href = URI;
    return true;
  }
}
/*
----------<head></head>内に記入
<script type="text/javascript" src="expander.js"></script>
----------折りたたまれる記事の上に
<p id="expander">
<a href="#expander" 
onclick="expand('#','subjoinder','expander');return false;" 
onkeypress="expand('#','subjoinder','expander');return false;">
続きを表示する
</a>
</p>
----------展開した文章を折りたたむ
<div id="subjoinder" style="display:none">
〜折りたたみたい内容を自由に記述〜
</div>
<p id="collapser" >
<a href="#expander" 
onclick="expand(0,'subjoinder','expander');return false;" 
onkeypress="expand(0,'subjoinder','expander');return false;">
折りたたむ
</a>
</p>
*/
