js语句问题

<html>
<body>
网页可正常连接<script>
  var schol=new Array("da1","da2","da2")
  function sb()
   {
     for(var i=0;i<schol.length;i++)
     document.write("<option value=schol[i]>schol[i]</option>")
   }
</script><select name="s1">
<script>sb()</script>
</select></body>
</html>上面语句下拉列表框的内容是字符串'schol[i]' 而不是数组的值，应该怎么改啊