Anyone willing to help an idiot with a simple htaccess

[Snagglepuss]

I'm having a couple small problems that htaccess should remedy. Unfortunately I have no freaking clue as my old server did all of this for me.


Situation 1
I need have a folder that I need to keep everyone out of except for one domain and one url that I use to access it myself. (This is for a avs kind of thing) So I'd imagine I'd need something like

Allow
http://www.alowed_domain.com
http://www.mydomain.com/avsacesspage.html
deny all others and send to http://www.mydomain/avsfrontpage.html



Situation 2
I have this moocher on some special galleries. He has various domains and some of them are have the same words like Venus.com and Venus.net. So I need to be able to add multiple domains and let everyone else in. So I might need something like this.

Allow all
Deny and send to http://www.wherever/pissoff.html
*Venus*
http://www.moocher.com/
etc so I can add new moochers.


I know the syntax is crazy but I figured if I wrote it out it would give everyone a better ideal of what I need. Anyone have any ideals on how to make this real?