Magento - Need Many Websites From One Install

Hi,

I am wanting to luanch many ecommerce sites. I have shared hosting that allows unlimited add on domains. my domains for my ecommece sites will be hosting viua one core domain but have add on domains branching out.

I have installed magento 1.7 community edition on my core website into a sub folder ie website1.com/shop - sop being the root.

i am starting for now with two additional websites, website2.com and website3.com

i have created two new websites / store in magento backend but i cant get the websites, 2 and 3 to redirect to the core install website1.

I need a developer to change my .htaccess or index.php - I cant figure it out myself.

If you know how to do this with a shared hosting platform on linux, please bid.

Would need the successful bidder to make sure evrything else will also work such a shared cart / checkout etc.

thank you.