检验表单的checkbox是否选择,怎么不行?错在哪里?看里面的代码

this is not a Java problem, but try<script language="JavaScript">
function checkchoose()
{
//change "FormName" to the name of your form
  var elements = document.FormName.elements;
  for(var i=0;i<elements.length;i++)
  {
    if(elements[i].type == "checkbox" && elements[i].checked)
      {
       return true;
      }
  }
  alert("请选择需要管理的来访者！");
  return false;
}
</script>