function Alert(message)
{
    var dialog=new Dialog("系统消息");
	dialog.Alert(message);
	dialog.Alert.Dispose=function ()
	{			
	};   
};
function Login()
{
	if (document.getElementById("UserNameTextBox").value=="")
		{
			var dialog=new Dialog("系统消息");
			dialog.Alert("请输入用户名！");
			dialog.Alert.Dispose=function ()
			{
				document.getElementById("UserNameTextBox").focus();
			}      
			return false;
	}
	if (document.getElementById("PasswordTextBox").value=="")
	{
			var dialog=new Dialog("系统消息");
			dialog.Alert("请输入密码！");
			dialog.Alert.Dispose=function ()
			{
				document.getElementById("PasswordTextBox").focus();
			}      
			return false;
	}
   return true;
}