如何在单击登录按钮时隐藏注册表单，并且登录表单折叠反之亦然

Im trying to make the form of registration or login hide and when the register or login button is clicked, the form will collapse. The codes work just fine but i want to make it when the login button is clicked, the login form will collapse and when the user wants to click on the register button, the login form will hide and the register form will collapse vice versa. I've tried the javascript but it turns out to be a mess. Somebody please helpIm trying to make the form of registration or l