Actually I read every word of your original post and, based on it:
I have created a site where I want to blog about my new born daughter. Since there is a lot of sick people out there I only want relatives and frinds with login and password to see the site.
My response was exactly right, as you say NOTHING about a gallery, or anything other than “…I want to blog…”.
Tell us exactly what you want, what your set up is, gallery software, how its working together with the blog, and maybe we can actually give an informed answer!
If you’d asked the right question in the first place, or clarified that you wanted your gallery, etc. blocked, when I first replied, then this would be a much simpler thread.
The more you tell us about what you’ve got and what you’re trying to do with it, the more useful replies can be.
The plugin will do an easier job than 4k’s suggestion as you don’t need to type anything for every post you want to hide (which is ALL you objected to in my first reply), but as we don’t know your gallery package we have no way of knowing if this will have any effect on it.