// Show/Hide UPloadfiles
function showUP(){
  try{
    var up=document.getElementById("gc");
    if(up){
      if(up.style.display=='none'){
        up.style.display='block';
      }else{
        up.style.display='none';
      }
    }else{
      document.location="guestbook.asp";
    }
  }catch(e){}
}
/////
function checkform(form)
{
if (form.g_name.value=='')
  {
    window.alert('姓名不能为空！');
    return false;
   }
if (form.g_title.value=='')
  {
    window.alert('标题不能为空！');
    return false;
   }
if (form.g_content.value=='')
  {
    window.alert('请填写留言内容！');
    return false;
   }
   
 return true
}