function chk(){
	if (document.LoginTab.username.value==""){
	alert("提示\n\n请输入用户名！");
	document.LoginTab.username.focus();
	return false;
	}
	if (document.LoginTab.password.value==""){
	alert("提示\n\n请输入密码！");
	document.LoginTab.password.focus();
	return false;
	}
}
document.getElementById("LoginBox").innerHTML = '<form id="LoginTab" name="LoginTab" method="post" action="BBS/login.asp?action=chk" onsubmit="return chk();"><div style="margin:5px 0px;">用户名：<input name="username" class="TextInput" tabindex="1" size="16" maxlength="64" tyep="text" \/><input name="f" type="hidden" id="f" value="/index.asp" \/><\/div><div>密　码：<input name="password" type="password" class="TextInput" tabindex="2" size="16" maxlength="64" \/><\/div><div style="margin:5px 0px;text-align:left;padding-left:45px;"><input class="btn3" tabindex="5" type="submit" value=" 立 即 登 录 " name="submit" \/><\/div><div style="text-align:right;">【<a href="BBS\/lostpass.asp" target="_blank">忘记密码<\/a>】 【<a href="BBS\/reg.asp?action=apply" target="_blank">用户注册<\/a>】<\/div></Form>'