var username=null,password=null,backurl=null;
function login(){
	if(username==null)
		username=$("username");
	if(password==null)
		password=$("password");
	if(username==null)
		backurl=$("backurl");
	if(username.value==''){alert('用户名不能为空');return false;}if(password.value==''){alert('密码不能为空');return false;}
	$("backurl").value=window.location;
}
function guestLogin(){
	if(document.anonymous.guestname.value== '输入昵称' || document.anonymous.guestname.value=="")
	{
		alert('请输入昵称！');
		document.anonymous.guestname.focus();
		return (false);
	}	
}
function OpenLoginWindow(){
//$("BodyDiv").className='alphatable';
//$("LoginTable").className='ShowLoginTable';
$("LoginTable").style.display='block';
//$("LoginTable").style.left = (document.body.clientWidth-200)/2 - 50;
//$("LoginTable").style.top = document.body.scrollTop;
//$("LoginTable").style.top = document.body.scrollTop + document.body.clientHeight / 2 - 120;
//$("username").focus();
$("color").style.visibility = 'hidden';
//$("font").style.visibility = 'hidden';
//$("size").style.visibility = 'hidden';
//$("select").style.visibility = 'hidden';
}
function HiddenLoginWindow(){
//$("BodyDiv").className='';
//$("LoginTable").className='HiddenLoginTable';
$("LoginTable").style.display='none';
$("color").style.visibility = '';
//$("font").style.visibility = '';
//$("size").style.visibility = '';
//$("select").style.visibility = '';

}
function EditUserName(classname){
$("html_guest_username").className=classname;
}