What ruinexplorer said is true, you will lose in birghtness and also resolution, if you donb't wanna spend the money in a new projector you can make keystone or wrap by software: like resolume, mad mapper, ETC.
I think that your best option is to buy a Matrox triplehead2go that allows you to divide one output into there, an then use Resolume arena to run the show, it's really easy to start with. and there is a lot of free tutorials out there. this way you can have completly diferent conten on each...