function dologin(){
	var uname = document.getElementById('uname').value;
	var pwd = document.getElementById('pwd').value;
	if(uname == ''){ alert('用户名不能为空'); return false; }
	if(pwd == ''){ alert('登录密码不能为空'); return false; }
	
	var logform = document.getElementById('logform');
	logform.submit();
}