var div = document.getElementById('idTopJoinName');
if (typeof(inc_msg_JoinName_js_) == "string")
	div = document.getElementById(inc_msg_JoinName_js_);

div.innerHTML = "<a href='http://www.storyhouse.com.tw/main/modules/MeMemberInfo/index.php?sn=&content=Join'>加入會員</a>";